NCERT Solutions For Class 7 English Honeycomb Chivvy (Poem)

NCERT Solutions For Class 7 English Honeycomb Chivvy (Poem)

Page No: 70

A Working with the Poem

Question 1:
Discuss these questions in small groups before you answer them.

  1. When is a grown-up likely to say this? Don’t talk with your mouth full.
  2. When are you likely to be told this? Say thank you.
  3. When do you think an adult would say this? No one thinks you are funny.

Solution:

  1. The grown-ups are likely to tell the children not to talk while their mouth is full of food.
  2. The children are likely to be reminded to Say thank you when they receive a gift or a favour from someone.
  3. Adults are likely to tell children, ‘no one thinks you are funny’ when the children are too shy to speak or perform before the others.

Question 2:
The last two lines of the poem are not prohibitions or instructions. What is the adult now asking the child to do? Do you think the poet is suggesting that this is unreasonable? Why?
Solution:
The adult is now asking the child to think independently. The poet finds this entirely unreasonable because the young child has not been trained to use his mind. He has only been trained to follow the instructions given by the adults.

Question 3:
Why do you think grown-ups say the kind of things mentioned in the poem? Is it important that they teach children good manners, and how to behave in public?
Solution:
The adults constantly give instructions to their children for various reasons. They try to train them to behave in a decent, well-mannered and Sophisticated way. This, however, robs away their childlike innocence.

Question 4:
If you had to make some rules for grown-ups to follow, what would you say? Make at least five Such rules. Arrange the lines as in a poem.
Solution:
Don’t dictate and impose your rules. Your ways and thinking is different from ours and so are the times. Don’t talk over the phone while eating. Please spend some time with us.

Very Short Answer Type Questions

Question 1:
Why do the grown-ups tell the children not to talk with their mouth full?
Solution:
The grown-ups tell the children not to talk with their mouth ful of food because it is bad manners to talk while eating.

Question 2:
What all instructions are given by the adults regarding noise?
Solution:
The adults tell the children not to make much noise, neither while talking nor while eating or walking.

Short Answer Type Questions

Question 1:
What happens when the adults give too many instructions to their children?
Solution:
When the adults give too many instructions to their children, they kill their children’s spontaneity and willingness to use his/her mind to understand life. These instructions rob away their innocence, making them dependent on their elders.

Extract Based Question

Directions (Q. Nos. 1-6) Read the extract given below and answer the following questions.

Sit up
Say please
Less noise
Shut the door behind you
Don’t drag your feet
Haven’t you got a hankie?
Take your hands out of your pocket
Pull your socks up
Stand straight.

Question 1:
Why is the child asked to stand straight?
Solution:
The child is asked to stand straight because that shows that he is attentive.

Question 2:
What does walking by dragging feet suggest?
Solution:
Dragging feet while walking suggests bad manners.

Question 3:
Make a sentence of your own using the word ‘drag.’
Solution:
My brother forcibly dragged me to the fete.

Question 4:
Who is giving these instructions?
(a) The poet
(b) An adult
(c) A child
(d) The teacher
Solution:
(b) An adult

Question 5:
To whom are these instructions being addressed?
(a) The poet
(b) An adult
(c) A child
(d) The teacher
Solution:
(c) A child

Question 6:
Why would the child need a hankie?
(a) To clean his mouth.
(b) To clean his shoes.
(c) To clean his bag.
(d) To clean his slate.
Solution:
(a)To clean his mouth.

 

NCERT SolutionsMathsScienceSocialEnglishSanskritHindiRD Sharma

Noun Exercises For Class 7_

CBSE Class 7 English Grammar – Noun

CBSE Class 7 English Grammar – Noun

Noun Examples and Exercises for Class 7 CBSE

Definition of Noun
Naming word is noun.
Or
A word used to show the name of person,thing, quality, idea or state is called noun.
e.g.

  1. Jacob is a good athlete.              (Name of person)
  2. Nepal is a beautiful place.          (Name of place)
  3. I have got a glass bottle.             (Name of thing)
  4. Lovers like silence.                     (Name of quality)
  5. Death is inevitable.                     (Name of state)

Noun Chart For Class 7 or Types of Noun

Proper Noun
The name given to a particular person, place or thing.
Or
The name given to a noun which is one of a kind or unique in its own.
e.g.

  1. Vikramaditya was a just king.       (Proper Noun)
  2. Rajasthan is a sandy area.               (Proper Noun)

Common Noun
The name given, to the nouns of a same class is common noun.
e.g.

  1.  Boys are hardworking.         (Common Noun)
  2.  Lions will never eat grass.   (Common Noun)

Exception
Sometimes proper nouns are used as common nouns when they represent the quality they possess. In such a case we use ‘the’ before the proper noun,
e.g.

  1.  Rahul is the Sachin of our school.
  2. Vidya is the Rekha of the club.

Proper noun as common noun
This means Rahul is‘a very good cricketer’, like Sachin.

Proper noun as common noun
This means Vidya is ‘like the heroine Rekha’. Hence, here the proper nouns take article ‘the’.

Material Noun
Names given to the things which we cannot but can weigh or measure are material nouns.
Or
Material objects are not the things in themselves but are used to produce new things from them.
e.g.

  1.  Gold is a costly metal.          (Material Noun)
  2. Door is made up of plastic.  (Material Noun)

Collective Noun
Noun that refers to a group, collection or gathering is called collective noun.
e.g.

  1.  The class seems to be noisy.         (Collective Noun)
  2.  A bunch of flowers is beautiful.   (Collective Noun)
    Noun Case Exercises For Class 7

Abstract Noun
Noun that is used for the action, state, quality is called abstract noun.
e.g.

  1. Hunger made the farmer weary.      (Abstract Noun)
  2. Youth are’the future of the country  (Abstract Noun)

Nouns can further be classified as

(i) Countable Nouns
Nouns which can be counted are countable nouns,
e.g.

  1.  Eggs are sold Rs. 60 a dozen.
  2.  Five new girls are admitted.
    Underlined words are examples of countable nouns.

(ii) Uncountable Noun
Nouns which can’t be counted are uncountable nouns.
e.g.

  1. Milk is useful for everyone.
  2. Bread is given to the patients.

Noun : Number
Number is that grammatical entity that tells us about the fact if the noun is just one or more than one.

Types of Number
(i) Singular
If the noun is just one in number, it is singular, e.g. cow, boy, place, radio etc.
(ii) Plural
If the noun is more than one, it is plural, e.g. cows, boys, places, radios etc.

Rules for Changing the Singular into Plural

Rule 1
Nouns that end with a consonant are made plural by adding ‘-s’ to the singular.
Parrot    –     Parrots
Egg        –      Eggs
Boat       –     Boats
Actor     –     Actors
Cook     –      Cooks
Hat          –   Hats

Rule 2
Nouns that end with -s, -ss, -ch pluralised by adding ‘-es’.
Bus         –       Buses
Glass       –      Glasses
Bench     –      Benches
Bush       –      Bushes
Quiz        –     Quizzes
Tax          –     Taxes

Exception
Stomach    –     Stomachs
Monarch   –     Monarchs

Rule 3
Nouns that end with -o and there is a consonant before -o then plural is made by adding ‘-es’.
Tomato      –     Tomatoes
Mosquito    –    Mosquitoes
Mango       –      Mangoes
Hero          –      Heroes

Exception
Photo     –        Photos
Zero        –       Zeros

Rule 4
Nouns that end with -y and there is a consonant before -y, then plural is made by changing ‘y’ to ‘i’ and adding ‘-es’.
Fly        –       Flies
Story    –       Stories
Baby      –     Babies
Family  –     Families
Copy      –    Copies
Library   –   Libraries

Rule 5
Nouns that end with -y and there is a vowel before -y, then plural is made by adding ‘-s’.
Boy     –     Boys
Day      –   Days
Key      –   Keys
Way     –   Ways
Toy      –    Toys
Essay   –   Essays

Rule 6
Nouns that end with double vowel are pluralised by adding ‘-s’.
Tree     –       Trees
Bee       –      Bees
Zoo      –       Zoos
Radio    –     Radios
Portfolio –  Portfolios
Bamboo  –  Bamboos

Exception
Roof        Roofs

Rule 7
Some nouns are pluralised by the change in their inside vowel.
Tooth     –     Teeth
Foot        –     Feet
Mouse    –     Mice
Man       –     Men

Rule 8
Nouns that end with -f or -fe pluralised by adding ‘-es’ after -f or -fe is changed to ‘-v’.
Knife       –      Knives
Thief       –      Thieves
Wife        –      Wives
Life        –        Lives
Chief       –      Chiefs
Proof      –       Proofs
Scarf      –       Scarfs/Scarves

Rule 9
Compound nouns are pluralised by adding ‘-s’ to the principal word.
Step-son                 –           Step-sons
Brother-in-law        –        Brothers-in-law
Pea-cock Pea-cocks  –     Passer-by Passers-by

Exception
Man-servant    –      Men-servants
Lord-justice     –      Lord-justices

Rule 10
Nouns that end with ‘-man’ are made plural
changing ‘-man’ into ‘-men’.
Woman          –    Women
Postman         –    Postmen
Watchman    –    Watchmen
Chairman      –    Chairmen
Milkman       –     Milkmen
Fellowman    –    Fellowmen

Types of Gender

Noun : Gender
Gender of a noun denotes the difference they have in terms of their sex.

  1. Masculine Gender that denotes male sex.
    e.g. Boy, Horse, Father
  2. Feminine Gender that denotes female sex. e.g. Girl, Mare, Mother
  3. Common Gender that denotes either sex.
    e.g. Doctor, Teacher, Child
  4. Neuter Gender that denotes neuter things or non-living things.
    e.g. Pen, Table, Glass

Rules for Changing Masculine into Feminine

Rule 1
Masculine can be changed into feminine by adding ‘-ess’.
Poet       –     Poetess
Lion       –     Lioness
Host       –    Hostess
Giant     –     Giantess

Exception
God   –   Goddess

Rule 2
In some nouns,- ending in ‘r’, after
Masculine can be changed into feminine by adding ‘-ess’ removing the ‘vowel’ before the last letter.
Tiger        –    Tigress
Monitor   –    Monitress
Masculine can be changed into the feminine by using a completely different word.
Actor – Actress
Editor – Editress

Rule 3
King      –      Queen
Hero     –      Heroine
Uncle    –      Aunt
Husband  –  Wife

Rule 4
Feminine of the compound nouns are made by changing the masculine word of the compound noun that comes to the front.
She-bear          –         He-bear
Cow-calf         –           Bull-calf
She-goat           –        He-goat
Daughter-in-law  –  Son-in-law

Rule 5
Feminine of some masculine are made by removing the last vowel and consonant and then by adding ‘-ess’.
Governor     –     Governess
Murderer     –     Murderess

Exception
Duke      –     Duke

Rule 6
Compound nouns change their gender by changing masculine word into feminine coming later.
Headmaster     –    Headmistress
Grandfather   –      Grandmother
Milkman         –      Milkmaid
Peacock         –        Peahen

Practice Questions on Nouns For Class 7 and Solutions

Question 1:
In the sentences given below identify nouns and state what type of noun it is.

  1.  A dog likes to eat bread.
  2.  Police have given a grand party to public.
  3.  The monitor told the class to keep mum.
  4.  Hari likes to read Indian story always.
  5.  The Ganga flows from the Himalayas.
  6.  A Bengal tiger looks great.
  7.  A man was standing there.
  8.  Players were playing football.
  9.  Oranges are a costly fruit.
  10.  Eggs were broken by a boy.

Solution:

  1.  Noun dog                 Common noun
    Noun bread              Common noun
  2.  Noun police             Collective
    Common noun
    Noun public             Collective noun
  3.  Noun monitor        Common noun
    Noun class              Collective noun
    Noun mum              Abstract noun
  4.  Noun Hari              Proper noun
    Noun Indian story                 Proper noun
  5.  Noun Ganga, Himalaya         Proper Noun
  6.  Noun Bengal tiger                   Proper noun
  7.  Noun Man                               Common noun
  8.  Noun Players                         Common noun
    Noun Football                         Proper noun
  9.  Noun Oranges                        Proper noun
    Noun Fruit                               Common noun
  10.  Noun Eggs                              Common noun
    (Countable)
    Noun Boy                                Common noun

Question 2:
In the sentences given below some nouns are countable and some are uncountable. Find the noun and state what type it is.

  1.  Hari bought rice and pulse for himself.
  2.  Maruti is selling a number of cars.
  3.  The forest has many trees to cut.
  4.  Cow gives us milk to drink.
  5.  Labourer works hard to finish the work.
  6.  I love the sweets that are attractive.
  7.  Water is a very precious mineral.
  8.  The apples he bought were very raw.
  9.  There are many ways to solve a question.
  10.  A stampede occurred yesterday due to the crowd.

Solution:

  1.  Uncountable pulse, rice (Material noun)
  2.  Countable car (Common noun)
  3.  Countable trees (Common noun)
  4.  Countable cow (Common noun)
    Uncountable milk (Material noun)
  5.  Countable laborer (Common noun)
    Uncountable work
  6. Uncountable sweets (Common noun)
  7.  Uncountable water (Material noun)
  8.  Countable apples (Proper noun)
  9.  Countable many ways, question (Common noun)
  10.  Countable crowd (Collective noun)

Question 3:
Fill in the blanks with suitable words.

  1.  A swarm of ………… are flying all around.
  2.  A …………… of musicians were performing.
  3.  Farmers keep a ……….. of buffaloes.
  4.  A …………. of girls could be seen here always.
  5.  The house was on the target by a gang of ……………
  6.  The board of ………….. decided to postpone it.
  7.  Mr Arora  booked ………….. of rooms in a hotel.
  8.  A troop of ………….. looks elegant on the go.
  9.  Forests show you a clump of …………..
  10.  The minister crossed with a heavy fleet of …………..

Solution:

  1.  bees
  2.  band
  3.  herd
  4.  bevy
  5.  thieves
  6. directors
  7.  a suite
  8. lions
  9.  trees
  10. cars

Question 4:
Make the plurals of the nouns given below.

  1.  Owl
  2.  Prime Minister
  3.  Goat
  4. Brush
  5.  Key
  6.  Negro
  7.  Kiss
  8.  Dish
  9.  Lady
  10.  Dwarf
  11.  Farmer
  12. Queen
  13.  Step-son
  14.  Louse
  15.  Cargo

Solution:

  1.  Owls
  2.  Prime Ministers
  3.  Goats
  4.  Brushes
  5.  Keys
  6. Negroes
  7.  Kisses
  8. Dishes
  9.  Ladies
  10.  Dwarfs
  11.  Farmers
  12.  Queens
  13.  Step-sons
  14. Lice
  15.  Cargoes

Question 5:
Match the following.
Nouns Worksheet For Class 7
Solution:
(i)  (d)       (ii) (a)
(iii) (e)      (iv) (b)
(v) (c)

Question 6:
Fill in the blanks using the opposite gender of the noun given in the bracket.

  1.  She likes the ………… of this movie. (hero)
  2.  It is a ritual to ride a ………….. during the wedding procession. (horse)
  3.  Farmers keep the …………. for the production of egg. (cock)
  4.  The …………. didn’t respond to the call, (waitress)
  5.  The …………. killed the wild beast easily. (huntress)
  6.  A …………… can give birth to four puppies, (dog)
  7.  Life for a ………….. is luxurious. (queen)
  8.  The ………….. presented his poems. (poetess)
  9.  Katrina is a beautiful …………… (actor)
  10.  The …………. delivers milk to us daily, (milkman)

Solution:

  1.  heroine
  2.  mare
  3.  hen
  4.  waiter
  5.  hunter
  6.  bitch
  7.  king
  8.  poet
  9.  actress
  10.  milkmaid

Question 7:
In the given sentences identify the case of the noun.

  1.  Prime Minister is going to Japan today.
  2.  Flowers smell so good.
  3.  Father teaches the child in the night.
  4.  Mohit is busy with school’s work.
  5.  The judge will sentence the thief later.
  6.  Anshu refused this on conscience’s call.
  7.  Vijay decorates the house beautifully.
  8. Jenifer’s decision can’t be changed now.
  9.  Sadhna is listening to Rahman’s music.
  10.  Umpire declared the batsman out now.

Solution:

  1.  Subject     –    Prime Minister
  2.  Subject      –   Flowers
  3.  Subject     –    Father
    Object       –    Child
  4.  Subject      –   Mohit
    Possession  –  School’s
  5.  Subject       –   The judge
    Object        –    The thief
  6.  Subject     –     Anshu
    Possession  –  Conscience’s
  7.  Subject      –   Vijay
    Object       –    House
  8. Possession  – Jenifer’s
  9. Subject      –   Sadhna
    Possession –  Rahman’s
  10.  Subject     –   Umpire
    Object     –     Batsman

Heat Class 7 Extra Questions Science Chapter 4

Extra Questions for Class 7 Science PDF are provided here. Students can download the pdf of these solutions from the given links. Heat Class 7 Extra Questions Science Chapter 4 provided in accordance with the latest syllabus of CBSE which, in turn, help the students to build a strong foundation and secure excellent marks in their board exams. https://meritbatch.com/heat-class-7-extra-questions/

Heat Class 7 Extra Questions Science Chapter 4

Heat Class 7 Science Extra Questions Very Short Answer Type

Class 7 Science Chapter 4 Heat Extra Questions Question 1.
In a mercury thermometer, the level of mercury rises when its bulb comes in contact with a hot object. What is the reason for this rise in the level of mercury? [HOTSl
Answer:
As the temperature increases, then expansion in mercury takes place which leads to the rise in the level of mercury in thermometer.

Class 7 Science Chapter 4 Extra Questions Question 2.
Shopkeepers selling ice blocks usually cover them with jute sacks. Explain why. [NCERT Exemplar; HOTS]
Answer:
As we know that jute sacks is thermal insulators, it helps ice not to be melt immediately. So, shopkeepers used to cover ice blocks with jute sacks.

Heat Class 7 Extra Questions And Answers Question 3.
The radiators in cars are painted black. Explain why. [HOTS]
Answer:
Since, the black bodies are better radiators, so due to this reason, radiators in cars are painted black.

Ncert Solutions For Class 7 Science Chapter 4 Extra Questions Question 4.
To keep her soup warm, Paheli wrapped the container in which it was kept with a woollen clothes. Can she apply the same method to keep a glass of cold drink cool? Give reason for your Answer: [NCERT Exemplar; HOTS]
Answer:
Yes, she can apply the same method to keep a glass of cold drink cool because wool is a thermal insulator, and it cannot allow to heat pass through it.

Class 7 Heat Extra Questions Question 5.
A laboratory thermometer A is kept 7 cm away on the side of the flame while a similar thermometer B is kept 7 cm above the flame of a candle as shown in figure. Which of the thermometers A or Swill show a greater rise in temperature? Give reason for your answer: [NCERT Exemplar]
Heat Class 7 Questions And Answers
Answer:
Thermometer B will show a greater rise in temperature because heated air above the candle rises immediatly and increase the temperature of bulb of thermometer B quite greater than A.

Ncert Class 7 Science Chapter 4 Extra Questions Question 6.
While constructing a house in a coastal area, in which direction should the windows preferably face and why?
Answer:
Window should preferably towards the sea beach so that the sea breeze coming from sea keeps the house cool during the day time.

Heat Extra Questions Class 7 Question 7.
A circular metal loop is heated at point O as shown in figure. [NCERT Exemplar]
Heat Questions And Answers For Class 7
(a) In which direction, would heat flow in the loop?
(b) In which order, the pins at points P, Q and R fixed with the help of wax fall if points O, P, Q and R are equidistant from each other?
Answer:
(a) Heat will flow in both the directions from O to P and from O to R.
(b) First of all pin at P and R will fall simultaneously after that pin at Q will fall.

Class 7 Science Chapter 4 Extra Questions And Answers Question 8.
The mercury does not fall or rise in a clinical thermometer when taken out of the mouth. Explain why.
Answer:
Because of the kink present in the thermometer, the mercury does not fall or rise.

Class 7 Science Ch 4 Extra Questions Question 9.
If a pan is removed from the fire, then why does it cool down?
Answer:
When a pan is removed from the fire, it loses heat to the surroundings by radiation and it cools down.

Heat Chapter Class 7 Questions And Answers Question 10.
Name the mode of transfer of heat in which medium is not required.
Answer:
Radiation is the mode of transfer of heat in which medium is not required.

Ncert Solutions For Class 7 Science Chapter 4 Heat Extra Questions Question 11.
It is preferred to use two thin blankets rather than one thick blanket. Explain the reason. [HOTS]
Answer:
In case of two thin blankets, there is an air gap which does not allow heat pass out from the body and it is not as such as in case of one thick blanket.

Class 7 Science Chapter 4 Extra Question Answer Question 12.
Why is it advised not to hold the thermometer by its bulb while reading it?
Answer:
It is advised not to hold the thermometer bulb while reading it as the level of mercury increases from the actual reading by our body temperature.

Class 7 Science Heat Extra Questions Question 13.
Briefly mention one application of kink in the clinical thermometer.
Answer:
The clinical thermometer consists of kink which prevents the mercury level from falling on its own.

Class 7 Chapter 4 Science Extra Questions Question 14.
Explain how do we find out how hot an object really is.
Answer:
By using thermometer, we can measure the degree of hotness of a body.

Questions On Heat For Class 7 Question 15.
Is the body temperature of every person 37°C?
Answer:
No, the body temperature of every person is not 37°C. It is an average temperature. It could be slightly higher or slightly lower.

Chapter 4 Science Class 7 Extra Questions Question 16.
How can we measure the temperature of other object rather than human body?
Answer:
Temperature of other object is measured with laboratory thermometer because clinical thermometer is not suitable for higher temperature.

Extra Questions Of Heat Class 7 Question 17.
How does the heat travel in air?
Answer:
Heat travels in air through convection.

Extra Questions Of Chapter Heat Class 7 Question 18.
We are advised to use an umbrella when you go out in the sun. Comment.
Answer:
We use an umbrella to protect us from heat coming from the sun in the form of radiation.

Heat Chapter Class 7 Extra Questions Question 19.
You may have noticed that a few sharp jerks are given to clinical thermometer before using it. Why is it done so? [NCERT Exemplar; HOTS]
Answer:
Jerks are given to clinical thermometer before using it to settle down the mercury level below normal temperature so that the measurement taken of a body be accurate.

Heat Class 7 Science Extra Questions Short Answer Type

Class 7 Science Chapter Heat Extra Questions Question 1.
The handle of a pressure cooker is covered with the thick plastic. Explain why.
Answer:
As we know that plastic is a bad conductor of heat due to which the heat from the cooker does not flow to its handle and we can hold it easily.
So, this is a reason because of which the handle of a pressure cooker is covered with the thick plastic.

Ch 4 Science Class 7 Extra Questions Question 2.
Differentiate between two modes of transfer of heat, i.e. convection and conduction.
Answer:
Difference between convection and conduction

Conduction Convection
The mode of transfer of heat from the hotter part material to its colder part or from a hot material to a cold material in contact with it without the movement of material as a whole. So, this phenomenon is known as conduction The mode of transfer of heat from the hotter part of a fluid to its colder parts by the movement of liquid itself. So, this phenomenon is known as convection.
In all the solids, heat is transferred by the process of conduction In all the liquids and gases, heat is transferred by the process of convection

Question 3.
While reading a clinical thermometer, what precautions should we take?
Answer:
Reading a Clinical Thermometer

There are following steps to read the temperature on a thermometer.
Step I
Firstly, wash the thermometer with an antiseptic solution and if in case, the antiseptic solution is not available, then wash it with a clean water.
Step II
Gently, hold the thermometer tube in your hand and give it a jerk in such a way that the mercury thread in the thermometer tube falls below the reading of 35°C.
Step III
Now, put the bulb of the thermometer under the tongue of the patient for about one minute. Then take out the thermometer from patient’s mouth.
Step IV
In order to read the temperature, hold the thermometer horizontally in your hand and rotate it slowly. When we see a magnified image of the mercury thread in its tube, then a position will come. Now, read the temperature on thermometer tube in level with the top of the mercury thread.

Precautions while Reading the Thermometer

A clinical thermometer should not be used for any object other than the human body. There are some following precautions which are to be observed while reading a clinical thermometer.

  1. Wash the clinical thermometer before and after using preferably with an antiseptic solution.
  2. Be ensure that the mercury level before using the clinical thermometer should be below 35°C.
  3. The clinical thermometer should be read by keeping the level of mercury along the line of sight.
  4. While reading the clinical thermometer, it should never be held by the bulb.
  5. The clinical thermometer should be carefully handled.

Question 4.
Observe the picture given in figure. Water is being boiled in a pan of wide base.
Heat Class 7 Extra Questions Science Chapter 4 sh Q 4
(a) Which position P or T will feel warmer?
(b) Fill up the boxes P and T to indicate the mode of flow of heat to the hand.
Answer:
(a) As in the given diagram, position P will feel warmer because of heat, air rises.
(b) The flow of heat to P is a convection process and flow of heat to T is radiation.

Question 5.
For setting curd, a small amount of curd is added to warm milk. The microbes present in the curd help in setting if the temperature of the mixture remains approximately between 35°C to 40°C. At places where room temperature remains much below the range, setting of curd becomes difficult. Suggest a way to set curd in such a situation.[NCERT Exemplar; HOTS]
Answer:
For the setting of curd where temperature is below room temperature, the container in which curd is to be made must be kept in a thermally insulated cover or it can be wrapped with wool or jute sacks so that temperature is maintained for the setting of curd.

Question 6.
State the limitation of clinical thermometer.
Answer:
The clinical thermometer cannot be used for measuring the temperature of any object more than 42°C (i.e. more than the body temperature). If it kept in the sun or near a flame, then this clinical thermometer can be break.

Question 7.
Explain in brief, why we wear dark coloured clothes in winter and light coloured clothes in summer.
Answer:
We wear dark coloured clothes in winter to keep us warm as they absorb all the heat radiation coming from the sun whereas light coloured clothes reflect most of the heat radiation coming from the sun that falls on them and therefore we feel more comfortable wearing them in the summer.

Question 8.
Explain the reason for the shiny reflectors of room heaters.
Answer:
Since, the shiny surface absorbs very little heat due to which the reflectors reflect all the heat which makes the room heaters more effective. So, due to this reason, room heaters have shiny reflectors.

Question 9.
Describe the effects of heat.
Answer:
The effects of heat are
(i) When an object is heated, then it becomes hotter and may get expand. So, in this heat may change the state of the body like ice can also get change into the water.
(ii) Heat sometimes acts as a catalyst to speed up the chemical reaction.
(iii) Heat can even kill the bacteria as well.

Question 10.
The freezer is located at the top of the refrigerator. Explain why.
Answer:
The freezer is located at the top of the refrigerator. It is because the air inside and around the compartments of freezer gets cool and move downwards and on the other side, the lesser cool air moves upward to get cooled.
So, as a result of this, convection of heat are setup in the air and the tower section of the . refrigerator also gets cooled faster. .

Question 11.
Instead of water explain the reason, why do the mercury is used in the thermometer?
Answer:
Due to following reasons, mercury is used in the thermometers instead of water

  1. When the thermometer breaks, the mercury can be easily collected.
  2. Mercury can has more expansion than the water.
  3. Also, mercury do not stick on the walls of thermometer like water.

Question 12.
Explain the reason for the general fitting of air conditioner at higher level on the wall of the room.
Answer:
As a fact that warm air is much lighter than the cold air, so being heavier the cold air from air conditioner moves downwards while the hot air moves upwards at the lower level and gets cooled and come downwards once again. So, due to this convection of heat are set in the air and room gets warmer faster.

Question 13.
Briefly explain, why do the kites and eagles fly without flapping their wings.
Answer:
As it is a fact that the hot air during the day time surrounds the land gradually and rises up, due to which a convection air of heat develops. So, kites and eagles start moving along this rising current of heat without flapping the wings to fly high up in the sky.

Question 14.
In the arrangements A and B as shown in figure, pins P and Q are fixed to a metal loop and an iron rod with the help of wax. In which case are both the pins likely to fall at different times? Explain.
Heat Class 7 Extra Questions Science Chapter 4 sh Q 14
Answer:
As in the given figures A and B, in case A P and Q got equal heat, so pin fix at P and Q in case of a fall simultaneously.
But in case of B pin at point P falls first than after pin at Q will fall as because heat received at P is greater than Q at the same time.

Question 15.
At a camp site there are tents of two shades. One made with black fabric and the other with white fabric. Which one will you prefer for resting on a hot summer afternoon? Give reason for your choice. Would you like to prefer the same tent during winter? [HOTS]
Answer:
We will prefer white fabric tent in case of summer because it reflects all the radiations from the sun and keeps us cool inside the tent.
But in ease of winter, we should not use white fabric tent, we should use black fabric tent as it absorbs all colours of light from the sun and keeps us warm inside the tent.

Question 16.
Briefly explain the maximum and minimum thermometers.
Answer:
Maximum and minimum thermometers are the special thermometers which automatically record the maximum and minimum temperature of the day. The maximum and minimum temperature of the last day reported in weather reports in TV and newspapers are measured by the maximum and minimum thermometers.

Question 17.
Explain the reason for serving of tea in China clay cup and plates.
Answer:
Tea is generally served in China clay cup and plates because China clay is a bad conductor of heat which do not allow the heat to pass through it and hence keep the tea hot.

Question 18.
Describe briefly about the direction of the convection current during ventilation.
Answer:
Since, with the help of ventilators, warm air being higher get rises up and leaves the room. Even the fresh air enters the room from outside through the doors and windows.

Question 19.
Explain the reason for wrapping of ice in gunny bags.
Answer:
Since, we know that gunny bags consist of number of fine pores which are filled with air. As air is a bad conductor of heat, so due to this reason, it does not allow the external heat to move inside and melts the ice.

Question 20.
Mention any two examples each of insulators as well as of conductors.
Answer:
Copper and aluminium are the examples of conductors which allow the heat to pass through them. While wood and plastic are the examples of insulators which do not allow the heat to pass through them.

Question 21.
The clinical thermometer is not used to measure high temperature. Why?
Answer:
Clinical thermometer has the range 35°C to 42°C. If we use it to measure high temperature, it may break and mercury present in the clinical thermometer is harmful. So, we cannot use clinical thermometer to measure high temperature.

Heat Class 7 Science Extra Questions Long Answer Type

Question 1.
Explain the differences between heat and temperature.
Answer:
The differences between heat and temperature are given as below

Heat Temperature
It is a form of energy which flows from one body to another when there is a difference in temperature between the objects. It is the thermal condition of a body that indicates whether or not and in which direction, heat will flow from one body to the other.
It is equal to the sum of internal energies of the molecules of a body. It is proportional to average kinetic energy of the molecules of the body.
As a heat between two bodies, total amount of heat of two bodies remains unchanged. As a conclusion of exchange of heat between two bodies, sum of their temperatures before and after exchange is not same.
SI unit of heat is joule (J). SI unit of temperature is kelvin (K).

Question 2.
Explain the reason for the following statement, “When heat is applied at the bottom of the water vessel, then
it gets heated more quickly than when it is heated at the top.” [HOTS]
Answer:
The particles of water become more lighter and rise up in the middle. Due to this, the cold particles of water which are heavier come down along the sides of the vessel. So, the convection currents of heat are setup and water becomes hot. The moment, when the heat is applied at the top, then the water present in the upper portion becomes hot and these hot water molecules get fixed over the surface. Since, water is a bad conductor of heat, due to which water present at the lower end (or bottom) of the vessel remains.

Question 3.
Prove with the help of an experiment that heat radiation can travel through vacuum.
Answer:
First of all, take a flat bottom flask and fix a rubber stopper having two holes in the mouth of the flask. Shift a thermometer through one hole and a glass tube with stopper through the other hole. Now, with the help of a vacuum pump, remove the air from the flask and try to record the temperature from the thermometer. Put a flask in the bright sunlight and we will observe that the thermometer records a rise in temperature. So, on this basis, we can say that this experiment proves that the heat radiation can travel through vacuum.

Question 4.
On last Monday, Pankaj was dealing immense cough and cold. Besides this, he was suffering from a great headache. So, he decided to take a leave on that day so that he could take some rest at his home. After one hour he thought to check his fever through a clinical thermometer, so before using it, he washed it and started shaking it very fastly in his hand, so that the mercury level of thermometer gets reduced. At the same time, his elder brother Vishwas scold him and suggested him to shake the thermometer slowly.
(a) State some precautionary measures while checking the fever through a clinical thermometer.
(b) Mention the values showed by the elder brother of Pankaj (i.e. Vishwas). [Value Based Question]
Answer:
(a) The following precautionary measures while checking the fever through a clinical thermometer are
(i) While reading the clinical thermometer, it should never be held by the bulb.
(ii) The clinical thermometer should be washed properly (before and after use).
(b) The values showed by the elder brother of Pankaj, Vishwas, are concern towards the way of using the clinical thermometer and the importance of money as well.

Question 5.
Last Sunday, Pooja on her week off entered in her kitchen to cook rice for her family in lunch time. The moment she put fry pan on the gas stove and lighted it through the matchstick, all of sudden her 5 years small daughter entered into the kitchen and tends to touch the hot fry pan. At the same time, Pooja saw her and pushed her away from the hot fry pan. In this way, she saved her child.
(a) Explain why do the fry pan are provided with the plastic handles?
(b) Mention the values represented by Pooja here towards her 5 years small daughter. [Value Based Question]
Answer:
(a) As we know that plastic is a bad conductor of heat which does not allow the heat to pass through itself. So, heat from the fry pan does not flow to the handle due to which we can hold it easily. So that’s why, the fry pans are provided with the plastic handles.
(b) The value showed by Pooja here is a great concern and careness towards her five years old small daughter.

Question 6.
Describe in detail about the occurrence of oceanic currents.
Answer:
Since, it is a fact that the water present in the ocean (near the equator) is heated by the sun to a very higher temperature than the water near the poles of the earth. It is due to the falling of the sun rays perpendicularly in the equatorial region. So, in the equatorial region, the ocean water expands and becomes lighter.

While on the other side, the water in the polar region remains cold and heavy. It leads to the flow of convection currents of heat of warm water from the equator towards the poles.

Heat of the cold water flow from the poles towards the equator just below the surface of ocean. So, these types of currents are known as oceanic currents.

Heat Class 7 Science Extra Questions Miscellaneous

Multiple Choice Questions

Question 1.
A marble tile would feel cold as compared to a wooden tile on a winter morning because the marble tile
(a) is a better conductor of heat than the wooden tile
(b) is polished while wooden tile is not polished
(c) reflects more heat than wooden tile
(d) is a poor conductor of heat than the wooden tile
Answer:
(a) is a better conductor of heat than the wooden tile

Question 2.
A beggar wrapped himself with a few layers of newspaper on a cold winter night. This helped him to keep himself warm because [NCERT Exemplar]
(a) friction between the layers of newspaper produces heat
(b) air trapped between the layers of newspaper is a bad conductor of heat
(c) newspaper is a conductor of heat
(d) newspaper is at a higher temperature than the temperature of the surroundings
Answer:
(b) air trapped between the layers of newspaper is a bad conductor of heat

Question 3.
Heat always flows
(a) from a colder object to a hotter object
(b) from a hotter object to a colder object
(c) in both the directions
(d) None of the above
Answer:
(b) from a hotter object to a colder object

Question 4.
Paheli and Boojho measured their body temperature. Paheli found her to be 98.6°F and Boojho recorded 37°C. Which of the following statements is true?
(a) Paheli has a higher body temperature than Boojho.
(b) Paheli has a lower body temperature than Boojho.
(c) Both have normal body temperature.
(d) Both are suffering from fever.
Answer:
(c) These two temperatures are different scales but their actual values are equal.

Question 5.
Boojho has three thermometers as shown in figure. He wants to measure the temperature of his body and that of boiling water. Which thermometer(s) should he choose? [NCERT Exemplar]
Heat Class 7 Extra Questions Science Chapter 4 mu Q 5
(a) Thermometers (i) and (iii) for measuring body temperature and (ii) for measuring the temperature of boiling water
(b) Thermometer (i) for measuring temperature of both
(c) Thermometer (ii) for measuring temperature of both
(d) Thermometer (iii) for measuring temperature of both
Answer:
(a) Thermometers (i) and (iii) are clinical thermometer and (ii) is laboratory thermometer.

Question 6.
Four arrangements to measure temperature of ice in beaker with laboratory thermometer are shown in figure (a, b, c, d). Which one of them shows the correct arrangement for accurate measurement of temperature?
Heat Class 7 Extra Questions Science Chapter 4 mu Q 6
Answer:
(a) Thermometer (a) has been put in correct way to measure the temperature.

Question 7.

Figure (a, b, c, d) shows the reading of four different thermometers. Indicate which of the reading shows the normal human body temperature?
Heat Class 7 Extra Questions Science Chapter 4 1
Answer:
(c) As we know that normal body temperature is 37°C. So, correct option is (c). .

Question 8.
Figure (a, b, c, d) shows a student reading of a doctor’s thermometer. Which of the figure indicates the correct method of reading temperature? [NCERT Exemplar]
Heat Class 7 Extra Questions Science Chapter 4 2
Answer:
(a) In first case, eyes of student are in level of the thermometer, so it is correct way to measure temperature using clinical thermometer.

Fill in the Blanks

Question 1.
Temperature is the measure of …….. of an object.
Answer:
Fill in the Blanks
hotness

Question 2.
The thermometer used to measure human body temperature is called …….. thermometer.
Answer:
clinical

Question 3.
The normal temperature of human body is …….. °C.
Answer:
37

Question 4.
A …… near the bulb of a clinical thermometer prevents mercury level from falling of its own.
Answer:
kink

Question 5.
In ……. generally, the heat is transferred by the process of conduction.
Answer:
solids

Question 6.
The water and air are …… conductors of heat.
Answer:
poor

Question 7.
In coastal areas, cold air flows in the day from sea to land. It is called …….
Answer:
sea breeze

Question 8.
When we come out in the sun, we feel ……..
Answer:
warm

Question 9.
All hot bodies radiate ……..
Answer:
heat

Question 10.
Wool is a ……. conductor of heat.
Answer:
poor

True/False

Question 1.
Our sense of touch about hotness or coldness is not always reliable.
Answer:
True

Question 2.
Normal temperature of human body is 98.6°C.
Answer:
False, it is because the normal temperature of human body is 37°C.

Question 3.
In all cases, heat flows from a hotter object to a colder object.
Answer:
True

Question 4.
Water at higher temperature feels more hot.
Answer:
True

Question 5.
Marking on clinical thermometer is from 0°C to 100°C.
Answer:
False, it is because the markings on the clinical thermometer is from 35°C to 100°C.

Question 6.
Shining thread in thermometer is the column of mercury.
Answer:
True

Question 7.
The materials which allow heat to pass through them easily are called conductors.
Answer:
True

Question 8.
Water and air are good conductors of heat.
Answer:
False, it is because water and air are the poor conductors of heat.

Match the Columns

Question 1.
Match the Column I with Column II.

Column 1 Column II
(a) Conduction (i) Wood, plastic, wool, air, water
(b) Convection (ii) Requires no medium
(c) Radiation (iii) Solids
(d) Conductors (iv) Metals
(e)Insulators (v) Liquids

Answer:
(a)-(ii). (b)-(v), (c)-(ii), (d)-(iv), (e)-(i)

Question 2.
Match the Column I with Column II.

Column 1 Column II
(a) Land breeze (i) Night
(b) Sea breeze (ii) A device to measure the degree of hotness
(c) Dark coloured surfaces (iii) Poor absorbers of heat
(d) Light coloured surfaces (iv) Good absorbers of heat
Thermometer (v) Day time

Answers:
(a)-(i), (b)-(v), (c)-(iv), (d)-(iii), (e)-(ii)

Nutrition in Plants Class 7 Extra Questions Science Chapter 1

Extra Questions for Class 7 Science PDF are provided here. Students can download the pdf of these solutions from the given links. Nutrition in Plants Class 7 Extra Questions Science Chapter 1 provided in accordance with the latest syllabus of CBSE which, in turn, help the students to build a strong foundation and secure excellent marks in their board exams. https://meritbatch.com/nutrition-in-plants-class-7-extra-questions/

Nutrition in Plants Class 7 Extra Questions Science Chapter 1

Nutrition in Plants Class 7 Science Extra Questions Very Short Answer Type

Class 7 Science Chapter 1 Extra Question Answer Question 1.
Potato and ginger are both underground parts that store food. Where is the food prepared in these plants? [NCERT Exemplar]
Anwer:
In both the plants, shoot system and leaves are above ground. They prepare food through photosynthesis and transport it to the underground part for storage.

Nutrition In Plants Class 7 Extra Questions With Answers Question 2.
Plants prepare their food using a different mode of nutrition than us. What is it?
Answer:
The mode of nutrition in plant is autotrophic, i.e. they synthesise their own food.

Class 7 Science Chapter 1 Extra Questions Question 3.
Photosynthesis requires chlorophyll and a few other raw materials. Add the missing raw materials to the list given below:
Water, minerals, (a) …… (b) …….
Answer:
(a) Sunlight
(b) Carbon dioxide

Ncert Solutions For Class 7 Science Chapter 1 Extra Questions Question 4.
The tiny openings present on the leaf surface. What are they called?
Answer:
Stomata are the tiny pores present on the surface of leaves through which gaseous exchange takes place in plants.

Nutrition In Plants For Class 7 Worksheet With Answers Question 5.
What is the function of guard cells of stomata?
Answer:
Guard cells help in controlling the opening and closing of stomata for gaseous exchange.

Nutrition In Plants For Class 7 Questions With Answers Question 6.
Which parts of the plant are called food factories of the plant?
Answer:
Leaves are referred to as food factories of plants. This is because, leaves synthesise food by the process of photosynthesis.

Ncert Class 7 Science Chapter 1 Extra Questions Question 7.
A carbohydrate is produced by plants as food source. It is constituted from which molecules?
Answer:
Carbohydrates are composed of carbon, hydrogen and oxygen.

Class 7 Science Ch 1 Extra Questions Question 8.
Why do some plants feed on insects?
Answer:
Insectivorous plants grow in soil which lack nitrogen, therefore they eat insects to fulfill their need of nitrogen.

Nutrition In Plants Class 7 Questions And Answers Question 9.
Define parasites.
Answer:
Parasites they are those organisms which grow on other plants or animals for their food, e.g. Cuscuta.

Nutrition In Plants Extra Questions Question 10.
Name the bacteria that can fix atmospheric nitrogen.
Answer:
Rhizobium is the bacterium which can fix atmospheric nitrogen.

Science Class 7 Chapter 1 Extra Questions Question 11.
Except plants, why can’t other living organisms prepare their food using CO2, water and minerals? [HOTS]
Answer:
Our body does not contain chlorophyll for absorbing solar energy which is necessary for preparing food using air, water, etc.

Class 7 Chapter 1 Science Extra Questions Question 12.
A leguminous plant can restore the soil’s concentration of mineral nutrients. Can you give examples of some such plants?
Answer:
Plants such as gram, pulses and beans are leguminous.

Ch 1 Science Class 7 Extra Questions Question 13.
Algae are green in colour. Why?
Answer:
Algae contain chlorophyll which imparts green colour to them.

Chapter 1 Science Class 7 Extra Questions Question 14.
what do you understand by nutrition?
Answer:
The process of utilising nutrients like carbohydrates, proteins, fats, etc., to generate energy is called nutrition.

Science Chapter 1 Class 7 Extra Questions Question 15.
Fungus can be harmful and useful. Give an example showing both of these traits of fungus.
Answer:
Fungus produces antibiotics like penicillin used to treat diseases and fungus can also harm us by causing fungal infections on skin and hair.

Extra Questions For Class 7 Science Nutrition In Plants Question 16.
A unique feature in leaves allows them to prepare the food while other parts of plants cannot. Write the possible reason for this. [HOTS]
Answer:
Leaves contain chlorophyll which is essential for food preparation and is absent in other parts of plant.

Class 7 Nutrition In Plants Extra Questions Question 17.
Algae and fungi form a unique association sharing benefits from each other. What is the name of association between them?
Answer:
Lichens.

Class 7th Science Chapter 1 Extra Questions Question 18.
In a plant, photosynthesis occurs in a part other than leaf. Name that plant and the part where photosynthesis occurs.
Answer:
Cactus, the part where photosynthesis occurs are stem and branches which are green.

Extra Questions On Nutrition In Plants Class 7 Question 19.
Why is Cuscuta, categorised as a parasite?
Answer:
Cuscuta derives its nutrition using an association where it deprives its host of all valuable nutrients and absorbs them itself. Hence, it is called a parasitic plant.

Extra Questions For Class 7 Science Chapter 1 Question 20.
Plant cannot use the nitrogen present in the soil directly. Why?
Answer:
Plants can use nitrogen only in soluble form while in soil nitrogen is present in inorganic form.

Class 7 Science Chapter 1 Important Questions Question 21.
Why are insectivorous plants called partial heterotrophs?
Answer:
Insectivorous plants are autotrophs, i.e. they prepare their own food. They are partial heterotrophs as they eat insects for obtaining nitrogen.

Questions On Nutrition In Plants Class 7 Question 22.
What is the stored food form in sunflower seeds?
Answer:
In sunflower seeds, glucose is stored in the form of oils (fats).

Nutrition In Plants For Class 7 Notes Questions And Answers Question 23.
What do you understand by saprotrophic mode of nutrition?
Answer:
The mode of nutrition in which organisms take their nutrients from dead and decaying matter is called saprotrophic mode of nutrition.

Nutrition In Plants Class 7 Worksheet With Answers Question 24.
A mutually beneficial relationship that occurs between two plants. It is known by what name? Give an example.
Answer:
Symbiosis is the mutually benefitting association between two plants, e.g. lichens.

Ncert Science Class 7 Chapter 1 Extra Questions Question 25.
For testing the presence of starch in leaves, a boiled leaf is used. Why?
Answer:
Boiling the leaf remove chlorophyll/green colour from the leaves.

Question 26.
Mosquitoes, bed bugs, lice and leeches suck our blood. Can they be called as parasites? [HOTS]
Answer:
Yes, these animals/insects are parasites as they harm the hosts while they suck blood.

Question 27.
Insectivorous plants have one or the other specialised organs to catch their prey. What is that organ?
Answer:
Leaves of insectivorous plants catches the prey.

Question 28.
Farmers spread manure of fertilisers in the field or in gardens, etc. Why are these added to the soil?
Answer:
Plants absorb mineral nutrients from soil. Thus, declining their concentration in soil fertilisers and manures enhance or add these essential nutrients back in soil.

Question 29.
A cell is formed of many sub-components. Identify different constituents of the cell. Are animal and plant cells similar?
Answer:
A cell contains nucleus, cytoplasm, vacuole, cell organelles like chloroplast, mitochondria, etc. No, animal cells are different from plant cells.

Question 30.
A goat eats away all the leaves of a small plant (balsam). However, in a few days, new leaves could be seen sprouting in the plant again. How did the plant survive without leaves? [NCERT Exemplar; HOTS]
Answer:
The plant of balsam survived on the food stored in the stem and roots.

Nutrition in Plants Class 7 Science Extra Questions Short Answer Type

Question 1.
Different modes of nutrition has been observed in plants. What are they? Give example of each.
Answer:
Plants show two major modes of nutrition, i.e.
(i) Autotrophs are those which can synthesise their own food.
(ii) Heterotrophs are those which are dependent on other plants and animals for their food. They are of following types:
(a) Parasites, e.g. Cuscuta
(b) Saprotrophs, e.g. fungi.

Question 2.
Sunlight, chlorophyll, carbon dioxide, water and minerals are raw materials essential for photosynthesis. Do you know where they are available? Fill in the blanks with the appropriate raw materials.
(a) Available in the plant: ………
(b) Available in the soil: ………
(c) Available in the air: ………
(d) Available during day : ……… [NCERT Exemplar]
Answer:
(a) Available in the plant: chlorophyll
(b) Available in the soil : water, minerals
(c) Available in the air : carbon dioxide
(d) Available during day : sunlight

Question 3.
Plants are considered an essential part of earth as they keep a check on lot of process occurring all over. What would happen if all the green plants are wiped from earth? [HOTS]
Answer:
Green plants are the source of energy for all the living organisms so that they can perform their normal functions. If all green plants and trees disappear, all the organism depending on them for food and shelter will also die.

The lack of gaseous exchange will lead to increase in amount of CO2, causing death in humans and other animals also. The cycle of life will gradually disappear.

Question 4.
Autotrophs and heterotrophs are two different organisms with distinct modes of nutrition state. How are they different from each other?
Answer:
The difference between autotrophs and heterotrophs are as follows:

Autotrophs Heterotrophs
They can prepare their own food. They cannot prepare their own food.
Autotrophs take simple inorganic substances and change it into complex organic food, e.g. green plants. They take in complex food and breakdown it into simple compounds, e.g. all animals, fungi and non-green plants.

Question 5.
Wheat dough if left in the open, after a few days, starts to emit a foul smell and becomes unfit for use. Give reason. [NCERT Exemplar; HOTS]
Answer:
Carbohydrates in wheat dough encourage the growth of yeast and other saprophytic fungi which breakdown carbohydrates into simpler compounds like CO2 and alcohol and emit a foul smell.

Question 6.
What are the various raw materials for photosynthesis?
Answer:
Plants utilise carbon dioxide from air and water and minerals are derived from soil (through roots) as raw material for photosynthesis. Besides these chlorophyll present in green leaf is necessary for the process and sunlight is the source of energy which is converted into chemical energy during the process of photosynthesis.

Question 7.
Observe the given figure and label the following terms given in the box. Stomatal opening, guard cell
Nutrition in Plants Class 7 Extra Questions Science Chapter 1 sh Q 7
Answer:
Labelled figure is given below:
Nutrition in Plants Class 7 Extra Questions Science Chapter 1 sh Q 7.1

Question 8.
Nitrogen is an essential nutrient for plants growth. But farmers who cultivate pulses as crops like green gram, bengal gram, black gram, etc., do not apply nitrogenous fertilisers during t cultivation. Why? [NCERT Exemplar; HOTS]
Answer:
Roots of pulses (leguminous plants) have a symbiotic association with a bacterium called Rhizobium. This bacteria convert gaseous nitrogen of air into water soluble nitrogen compounds and give them to the leguminous plants for their growth. Hence, farmers need not use nitrogenous fertilisers.

Question 9.
Pooja is worried about her new shoes which she wore on special occassions that they were spoiled by fungus during rainy season. Is she right to worry, if yes, then tell why does fungi suddenly appears during the rainy season? [HOTS]
Answer:
Yes, the fungi reproduces by spores which are generally present in the air and grow on any article that are left in hot and humid weather for a long time. During rainy season they land on wet and warm things and begin to germinate and grow.

Question 10.
In what unique manner does a pitcher plant derive its nutrition?
Answer:
Nepenthes or pitcher plant modifies its leaf axis into a long tubular pitcher to form a pitfall trap. Inside the pitcher sticky liquid is present. When any insect comes in contact with the leaf, the lid present on it is closed and insect is trapped. The liquid contains digestive enzymes which slowly digest the trapped insects.

Question 11.
Water and minerals are absorbed by the roots and then transported to leaves. How?
Answer:
Water and minerals are transported to the leaves by the vessels which run like pipes throughout the root, stem, branches and the leaves. These vessels are xylem and phloem, forming a continuous path or passage for the nutrients to make them reach the leaf.

Question 12.
Some plants have deep red, violet or brown coloured leaves. Can these leaves perform the photosynthesis process? [HOTS]
Answer:
Yes, plants having deep red, violet or brown coloured leaves can also carry out photosynthesis because they contain chlorophyll. But their green colour of chlorophyll is masked by the large amount of all other coloured pigments.

Question 13.
If plant has a requirement for nitrogen, then from where will they obtain it?
Answer:
Soil contains nitrogen in the form that is not usable by plants. Bacteria like Rhizobium converts nitrogen into soluble form that can be easily used by plants. So, if plant has a requirement for nitrogen, then it will obtain that which the help of bacteria.

Question 14.
In the absence of photosynthesis, life would be impossible on earth. Is it true or false?
Answer:
True, because photosynthesis is important for the existence of life on the earth. Photosynthesis is important process as it is provides food to all living organisms and maintains CO2 – O2 balance of nature.

Nutrition in Plants Class 7 Science Extra Questions Long Answer Type

Question 1.
Describe the process by which plants prepare their food using different raw materials.
Answer:
The process by which green plants can prepare their own food is called photosynthesis. Green plants possess chlorophyll in their leaf and utilises carbon dioxide (from air) water, minerals (from soil, through root) as raw material and sunlight as source of energy and convert light energy into chemical energy. The food thus synthesised is in the form of starch (carbohydrate). The overall reaction for photosynthesis can be given as follows:
Nutrition in Plants Class 7 Extra Questions Science Chapter 1 lo Q 1

Question 2.
Describe the method for replinishing the soils with minerals and other essential constituents used by plants growing in those soil by farmers.
Answer:
Replenishment of Nutrients in Soil

Crops require a lot of nitrogen to make proteins. After the harvest, the soil becomes deficient in nitrogen. Plants cannot use the nitrogen gas available in atmosphere directly. Action of certain bacteria can convert this nitrogen into form readily used by plants. Rhizobium bacteria live in the root nodules of leguminous plants. These bacteria take nitrogen gas from the atmosphere and convert it into water soluble nitrogen compounds making it available to the leguminous plants for their growth.

In return, leguminous plants provide food and shelter to the bacteria as Rhizobium cannot prepare its food. They, thus have a symbiotic relationship. This association is very important for the farmers, as they do not need to add nitrogen fertilisers to the soil in which leguminous plants are grown.

Question 3.
Harish went to visit his grandfather in village where he saw that his grandfather’s field of wheat are infected with fungus but no one is aware of this. Harish rushed to his grandfather’s side and told him that the field have been infected with fungi. He should use an antifungal agent in his fields to stop this infection.
(a) What is fungus?
(b) Can fungus only cause diseases or can it be helpful also?
(c) What values are shown by Harish? [Value Based Question]
Answer:
(a) Fungus are saprophytic organisms usually present as spores in atmosphere which can germinate on any substrate in optimal conditions.
(b) Fungus are also useful in that they produce many antibiotics which can cure different types of infections like penicillin.
(c) Harish is sincere, curious and knowledgeable with a keen sense of applying it where necessary.

Question 4.
Wild animals like tiger, wolf, lion and leopard do not eat plants. Does this mean that they can survive without plants? Can you provide a suitable explanation? [HOTS]
Answer:
Animals like tiger, wolf, lion and leopard are carnivores and do not eat plants. They hunt and eat herbivorous animals like deer, gaur, bison, zebra, giraffe, etc., which are dependent on plants for food.

If there are no plants, herbivorous animals will not survive and ultimately animals like tiger, wolf, lion and leopard will have nothing to eat.

Question 5.
Asha went to visit her grandfather in his village. He was having a serious discussion with his fellow members regarding the productivity level of crops for present year. They all were worried about how to increase the productivity of crop Asha listened to this and then suggested to the group that the reason may be decreased level of minerals in soil.
She told her grandfather to plant crops like pulses, gram, beans, etc., for a year then follow with regular crops. This will increase the crop productivity?
(a) What will you name the process suggested by Asha? Why is there decrease in crop productivity?
(b) What are noted benefits of this process? Will the results be as what Asha expressed?
(c) What values are shown by Asha? [Value Based Question]
Answer:
(a) This process is known as crop rotation. All the plants/crops grown in soil use the minerals present in soil for their own use. This continuous usage depletes the concentration of mineral in soil.
(b) After growing leguminous plants, the mineral content of soil is restored and enriched to new level. Yes, the benefit of leguminous plant is the re-enrichment of soil minerals.
(c) Asha is observant, sincere and interested in applying her knowledge to situations.

Nutrition in Plants Class 7 Science Extra Questions Miscellaneous

Multiple Choice Questions

Question 1.
Organisms which prepare food for themselves using simple naturally available raw materials are referred to as [NCERT Exemplar]
(a) heterotrophs
(b) autotrophs
(c) parasites
(d) saprophytes
Answer:
(b) autotrophs

Question 2.
In the process of photosynthesis, which of the following energy conversions occur?
(a) Solar energy is changed into chemical energy.
(b) Solar energy is changed into mechanical energy.
(c) Bioenergy is converted into chemical energy.
(d) Chemical energy is changed into light energy.
Answer:
(a) Solar energy is changed into chemical energy.

Question 3.
The raw material used by plants during photosynthesis
(a) N2 and O2
(b) O2, H2 and CO2
(c) CO2 and water
(d) water and minerals
Answer:
(c) CO2 and water

Question 4.
Which of the following statements is/are correct?
(i) All green plants can prepare their own food.
(ii) Most animals are autotrophs.
(iii) Carbon dioxide is not required for photosynthesis.
(iv) Oxygen is liberated during photosynthesis.
choose the correct answer from the options below: [NCERT Examplar]
(a) (i) and (iv)
(b) only (ii)
(c) (ii) and (iii)
(d) (i) and (ii)
Answer:
(a)  (i) and (iv) are correct statements and (ii) and (iii) are incorrect. Because (ii) animals are heterotrophs and (iii) CO2 is necessary for photosynthesis. Green plants prepare their own food from CO2 and H2O.

Question 5.
The symbiotic association is seen in which of the following?
(a) Lichens
(b) Algae
(c) Fungi
(d) Bacteria
Answer:
(a) Lichens

Question 6.
Pitcher plant traps insects because it
(a) is a heterotroph
(b) grows in soils which lack in nitrogen
(c) does not have chlorophyll
(d) has a digestive system like human beings
Answer:
(b) grows in soils which lack in nitrogen

Question 7.
Insectivorous plant among the following is
(a) lichen
(b) Cuscuta
(c) pitcher plant
(d) bread mould
Answer:
(c) pitcher plant

Question 8.
In the plant of cactus leaves are modified into
(a) branches
(b) spines
(c) leaf vein
(d) pitcher
Answer:
(b) spines

Question 9.
If iodine is dropped on the boiled leaf it gives blue-black colour due to the presence of
(a) starch
(b) protein
(c) fat
(d) vitamin
Answer:
(a) starch

Question 10.
When we observe the lower surface of a leaf through a magnifying lens, we see numerous small openings. Which of the following is the term given to such openings
(a) Stomata
(b) Lamina
(c) Midrib
(d) Veins
Answer:
(a) Stomata

Question 11.
Two organisms are good friends and live together. One provide? shelter, water and nutrients while the other prepares and provides food. Such an association of organisms is termed as
(a) saprophyte
(b) parasite
(c) autotroph
(d) symbiosis
Answer:
(d) symbiosis

Question 12.
In the process of photosynthesis, plants
(a) take O2 and release CO2
(b) take CO2 and release O2
(c) take and release O2
(d) take O2 and release water
Answer:
(b) take CO2 and release O2

Question 13.
Which of the following raw material is available in the air for photosynthesis? [NCERT Exemplar]
(a) Oxygen
(b) Carbon dioxide
(c) Nitrogen
(d) Hydrogen
Answer:
(b) Carbon dioxide

Question 14.
The ultimate source of food on earth is
(a) plants
(b) sunlight
(c) animals
(d) proteins
Answer:
(a) plants

Question 15.
Farmers use manure and fertilisers to
(a) replenish plant
(b) replenish soil
(c) replenish air
(d) replenish fungi
Answer:
(b) replenish soil

Fill in the Blanks

Question 1.
The association where two participating plants mutually benefit each other is called …….
Answer:
symbiosis

Question 2.
……. plants derive their nutrient from dead and decaying animals or plants.
Answer:
Saprophytic

Question 3.
The openings present on the surface of leaves are protected by cells called …….
Answer:
guard cells

Question 4.
Leaves are called the ……. of plants.
Answer:
food factory

Question 5.
All green plants possess ……. in their leaves.
Answer:
chlorophyll

Question 6.
Cuscuta is a ……. plant.
Answer:
parasitic

Question 7.
The plants that provide nutrition to the parasitic plant are called …….
Answer:
host

True/False

Question 1.
Food is necessary for plants only.
Answer:
False, food is necessary for all the living organisms as all of them grow and require maintenance from time to time

Question 2.
Animals are heterotrophs.
Answer:
True

Question 3.
Cells are called building block of a body.
Answer:
True

Question 4.
Chlorophyll is present in an animal cell.
Answer:
False, chlorophyll is present in leaf of plants not in animal cells.

Question 5.
Fungi are green plants that can synthesise their own food.
Answer:
False, fungi are not green and they are not classified as plants. They are saprophytic organisms which derive nutrition from dead and decaying matter.

Question 6.
Pitcher plant eats insects.
Answer:
True

Question 7.
Lichen is a saprophytic plant.
Answer:
False, lichen is a symbiotic association between an alga and a fungi. It is not a plant.

Question 8.
Rhizobium can fix atmospheric nitrogen into nitrogen compound.
Answer:
True

Match the Columns

Question 1.
Match the Column I with Column II.
Nutrition in Plants Class 7 Extra Questions Science Chapter 1 imgg Q 10
Answers:
1. (a) – (iv), (b) – (iii), (c) – (v), (d) – (vii), (e) – (i), (f) – (x), (g) – (ii), (h) – (vi), (i) – (viii), (j) – (ix)

Fibre to Fabric Class 7 Extra Questions Science Chapter 3

Extra Questions for Class 7 Science PDF are provided here. Students can download the pdf of these solutions from the given links. Fibre to Fabric Class 7 Extra Questions Science Chapter 3 provided in accordance with the latest syllabus of CBSE which, in turn, help the students to build a strong foundation and secure excellent marks in their board exams. https://meritbatch.com/fibre-to-fabric-class-7-extra-questions/

Fibre to Fabric Class 7 Extra Questions Science Chapter 3

Fibre to Fabric Class 7 Science Extra Questions Very Short Answer Type

Fibre To Fabric Class 7 Questions And Answers Question 1.
Name the sources of obtaining fibres.
Answer:
The sources of obtaining fibres are plants and animals.

Class 7 Science Chapter 3 Extra Question Answer Question 2.
Name some wool yielding animals.
Answer:
Wool yielding animals are sheep, yak, llama, alpaca, angora goat, angora rabbit and camel.

Fibre To Fabric Class 7 Extra Questions And Answers Question 3.
in which part of India, yak wool is common?
Answer:
Yak wool is common in the hilly regions of Ladakh.

Ncert Solutions For Class 7 Science Chapter 3 Extra Questions Question 4.
Rampur bushair and Bakharwal are the breeds of which animal-sheep or goat?
Answer:
Rampur bushair and Bakharwal are the breeds of sheep.

Fibre To Fabric Class 7 Worksheet With Answers Question 5.
How do the hair of certain animals help in keeping their bodies warm? [NCERT Exemplar]
Answer:
Hair traps a lot of air which is a poor conductor of heat resulting their body warm.

Class 7 Science Chapter 3 Extra Questions Question 6.
Write the name of the animal from which wool for pashmina shawls is obtained.
Answer:
Kashmiri goats.

Class 7 Science Ch 3 Extra Questions Question 7.
Name the goats which are found in Tibet and Ladakh.
Answer:
In Tibet and Ladakh, angora goats are found.

Class 7 Fibre To Fabric Extra Questions Question 8.
wool is obtained from which body part of sheep?
Answer:
Wool is obtained from the fleece or hair of sheep.

Class 7 Chapter 3 Science Extra Questions Question 9.
Name the natural fibre obtained from insects.
Answer:
Silk.

Ncert Class 7 Science Chapter 3 Extra Questions Question 10.
In which part, the wool yielding animals liama and alpaca are found?
Answer:
Liama and alpaca are found in South America.

Extra Questions Of Fibre To Fabric Class 7 Question 11.
For what purpose, rearing of sheep is done?
Answer:
The main aim to rear the sheep is to obtain wool.

Fibre To Fabric Class 7 Questions And Answers Pdf Question 12.
What term is used for the following process? Washing of sheep’s fleece to remove dust, dirt, dried sweat and grease.
Answer:
Scouring.

Fibre To Fabric Class 7 Extra Questions Question 13.
Out of scouring or shearing, which process comes first in the production of wool from sheep?
Answer:
The first step is shearing then scouring.

Chapter 3 Science Class 7 Extra Questions Question 14.
To which class, animal fibre or plant fibre, artificial silk belongs to?
Answer:
Artificial silk is a plant fibre.

Class 7th Science Chapter 3 Extra Questions Question 15.
Two fibres are made up of proteins. Name them.
Answer:
Silk and wool are two fibres which are made up of proteins.

Class 7 Science Fibre To Fabric Extra Questions Question 16.
Name the process of taking out silk fibres from the cocoon for use as silk.
Answer:
The process of taking out threads from the cocoons for use as silk is called reeling the silk.

Ch 3 Science Class 7 Extra Questions Question 17.
Name the stage next to caterpillar in the life cycle of silk moth.
Answer:
The stage next to caterpillar in the life cycle of silk moth is called pupa.

Science Class 7 Chapter 3 Extra Questions Question 18.
which stage in the life cycle of silk moth is called cocoon?
Answer:
The covering of silk fibres inside which the caterpillar covers itself is called cocoon.

Fibre To Fabric Extra Questions Class 7 Question 19.
Write the maximum length of continuous silk thread that can be obtained from a cocoon.
Answer:
The maximum length of continuous silk thread that can be obtained from a cocoon is more than that of 1000 feet (1000 to 1500 feet) continuous in length.

Animal Fibres Class 7 Questions And Answers Question 20.
Define the term ‘selective breeding’.
Answer:
The process of breeding of selective parents for obtaining special characters in their offspring such as soft under hair in sheep, is termed as selective breeding.

Fiber To Fabric Class 7 Extra Questions Question 21.
Silk fibre belongs to which class of organic substance?
Answer:
Protein.

Extra Questions For Class 7 Science Chapter 3 Question 22.
In the life history of silk moth as
Egg ➝ Larva (or caterpillar) ➝ Pupa ➝ Silk moth which actually makes the silk fibre? [HOTS]
Answer:
The larva (or caterpillar) of a silk moth makes the silk fibre.

Fibre to Fabric Class 7 Science Extra Questions Short Answer Type

Extra Questions Fibre To Fabric Class 7 Question 1.
Sheep are herbivores, so which type of feed (or food) is provided by shepherds? [HOTS]
Answer:
Sheep are herbivores, and prefer grass and leaves of various trees. Their food also contain a mixture of pulses, corn, jowar, oil cakes (material left after taking out oil from seeds) and minerals.

Question 2.
Write a caption for each of the figures given as figure (a-d).
Fibre to Fabric Class 7 Extra Questions Science Chapter 3 sh Q 2
Answer:
(a) Eggs of silk moth on mulberry leaves
(b) Silkworm
(c) Cocoon
(d) Cocoon with developing moth

Question 3.
Silk yarn of different textures can be prepared. Define the statement.
Answer:
The silk yarn is obtained from the cocoon of the silk moth. There is a variety of silk moths which look very different from one another and the silk yarn they yield is different in textures (coarse, smooth, shiny, etc.) Thus, tassar silk, mooga silk, kosa silk, etc are obtained from cocoons spun by different types of moths.

Question 4.
Write the difference between natural silk and artificial silk.
Answer:
Natural silk is obtained from the cocoons of silkworms and it is made up of a protein. Natural silk is an animal fibre. Artificial silk is obtained from wood pulp and it is made up of modified plant material ‘cellulose’.
If we perform the burning test, then natural silk fibre burns giving a smell of burning hair while artificial fibre burns giving a smell of burning paper.

Question 5.
Sorter’s disease is an occupational hazard. Explain.
Answer:
Wool industry is an important source of livelihood for many people in our country. The people who do the job of sorting (separating) the fleece of sheep into fibres of different qualities are called sorters. The sorter’s job is very risky because sometimes, they get infected by the bacteria called ‘anthrax’ which cause a deadly blood disease called sorter’s disease.

Question 6.
Write a short note on how first silk industry began in China.
Answer:
According to an old Chinese legend, the empress Si-lung-Chi was asked by the emperor Huang-ti to find the cause of the damaged leaves of mulberry trees growing in their garden. The empress found white worms eating up mulberry leaves. She also noticed that they were spinning shiny cocoons around them.
Accidentally, a cocoon dropped into her cup of tea and a tangle of delicate threads separated from the cocoon. This is how silk was discovered by chance. In this way, the first silk industry began in China.

Question 7.
Various steps involved to obtain wool from fleece are given here.

  1. Picking out the burrs
  2. Dyeing in various colours
  3. Shearing
  4. Scouring
  5. Sorting

Write the above steps in the correct sequence in which they are carried out. [NCERT Exemplar]
Answer:
Fibre to Fabric Class 7 Extra Questions Science Chapter 3 sh Q 7

Question 8.
Steps for the production of silk are given below in a jumbled order. Arrange them in their proper sequence. [NCERT Exemplar]
(a) Eggs are warmed to a suitable temperature for the larvae to hatch from eggs.
(b) Fibres are taken out from the cocoon.
(c) After 25 to 30 days, the caterpillars stop eating and start spinning cocoons.
(d) The larvae/caterpillars or silkworms are kept in clean trays along with freshly chopped mulberry leaves.
(e) Female silk moths lay eggs.
(f) Cocoons are kept under the sun or boiled in water.
Answer:
The correct order is
(e) Female silk moths lay eggs.
(a) Eggs are warmed to a suitable temperature for the larvae to hatch from eggs.
(d) The larvae/caterpillars or silkworms are kept in clean trays along with freshly chopped mulberry leaves.
(c) After 25 to 30 days, the caterpillers stop N eating and start spinning cocoons.
(f) Cocoons are kept under the sun or boiled in water.
(g) Fibres are taken out from the cocoon.

Question 9.
Cocoon is used to obtain silk thread. How?
Answer:
A pile of cocoon is used for obtaining silk fibre. The cocoon are kept under the sun, boiled water or exposed to steam.
The silk fibres separate out. The process of taking out threads from the cocoon for use as silk is called reeling the silk.

Question 10.
Name different types of silk. Which variety of silk is most common and how it is obtained?
Answer:
Different types of silk are mulberry silk, tassar silk, mooga silk and kosa silk. The most common variety of silk is mulberry silk. It is obtained from the cocoons of mulberry silkworm and is made up of protein. It is a natural silk and is an animal fibre.

Question 11.
Four different types of fibres are given to us. Out of these, two fibres (1 and 2) are obtained from plants and other two (3 and 4) fibres are obtained from animals. Fibre (1) is used in filling quilts and the yarn made of fibre (2) is used in making gunny bags, The yarn made from fibre (3) is used for knitting sweaters and yarn of fibre (4) is used for weaving saries. Name the four given fibres marked 1,2, 3 and 4. [HOTS]
Answer:
Fibre (marked 1) which is used in filling quilts is cotton and fibre (marked 2) is jute. (cotton and jute are plant fibres).
Fibre (marked 3) is wool and fibre (marked 4) which is used for weaving saris is silk. (wool and silk are animal fibres).

Question 12.
Why caterpillars need to shed their skin when they grow bigger but humans do not? Do you have any idea? [HOTS]
Answer:
The caterpillar eats day and night the leaves of mulberry tree and grows big in size whereas its skin does not increase in size, shape or length. During the feeding period, a silkworm sleeps four times (24 h each time) at intervals of six days.

While sleeping, its skin cracks and on awakening, the worm leaves the old skin and comes out in a new one. So, it sheds skin and this phenomenon is called moulting. After the final moulting begins, the last feeding period (of about ten days) after which the worm grows to its full size.

Question 13.
Radhika wanted to buy a silk frock and went to the market with her mother. There they found that the artificial (synthetic) silk was much cheaper and wanted to know why? Do you know why? Find out. [HOTS]
Answer:
Artificial (synthetic) silk called rayon is obtained from wood pulp and it is made of modified plant material cellulose. Synthetic silk can be prepared at a large scale in factories/mills. So, it is cheap. For obtaining pure silk, we have to rear silk moth, their larvae to get pupa.

To get silk thread, we have to dip cocoon in hot water to get silk thread which is wrapped over the cocoon. The pupa inside the cocoon dies. To obtain silk for commercial purposes, a large number of cocoons (containing living pupa) are killed. As a result, natural silk is costly.

Question 14.
From what type of health problems the workers suffered while working in a wool industry? [HOTS]
Answer:
People working in the wool industry sometimes get infected by a bacterium called anthrax, during the sorting (separating) the fleece of sheep into fibres of different qualities.
It leads to a fatal blood disease called sorter’s disease.

Question 15.
Write the different types of fibres that form the hair of sheep.
Answer:
There are following two types of fibres that form the hair to sheep

  1. The coarse beard hair.
  2. Fine soft under hair close to the skin.

Question 16.
Name the most common silk moth. What are the characteristics of silk fibres obtained from the cocoons of this silk moth?
Answer:
The most common silk moth is the mulberry silk moth. The silk obtained from the cocoons of mulberry silk moth is called mulberry silk. Mulberry silk is soft, lustrous (shiny) and elastic and can be dyed in different colours.

Fibre to Fabric Class 7 Science Extra Questions Long Answer Type

Question 1.
Paheli went to the market to buy sarees for her mother. She took out a thread from the edge of the two sarees shown by the shopkeeper and burnt them. One thread burnt with a smell of burning hair and the other burnt with the smell of burning paper. Which thread is from a pure cotton saree and which one from a pure silk saree? Give reason for your answer.  [NCERT Exemplar; HOTS]
Answer:
In first saree, one thread which burnt with a smell of burning hair is from pure silk, silk and hair are protein fibres. So, on burning these threads, a smell of burning hair comes out. In second saree, second thread which burnt with the smell of burning cotton and paper because cotton and paper both are carbohydrates and on burning they give similar smell.

Question 2.
Describe the life history of silk moth with the help of figures of various stages.
Answer:
Life History of Silk Moth Formation of Silkworm
The female silk moth lays eggs on mulberry leaves. The eggs are hatched into very small larvae within a week. The larvae of silk moth are called caterpillar or silkworm. The silkworms feed on the leaves of mulberry tree and grow bigger in size.
Fibre to Fabric Class 7 Extra Questions Science Chapter 3 lo Q 2
Development of Cocoon

When the silkworm (or caterpillar) is ready to enter the next stage of its development called pupa, it first weaves a net to hold itself. Then, it swings its head from side to side. During these movement of head, the silkworm secrets fibre made of protein which hardens on exposure to air and becomes silk fibre (or silk thread). Soon the silkworm (or caterpillar) covers itself by silk fibres and turns into pupa. This covering is known as cocoon. The silkworm continues to develop in the form of pupa inside the cocoon to form the silk moth.

Production of Silk

In order to produce silk, the silkworm developing inside the cocoon (as pupa) is not allowed to mature into an adult silk moth. So, as soon as the cocoon is formed, it is used to obtain silk fibres and the developing silkworm (as pupa) gets killed. Some of the silkworms (as pupae) are however, allowed to live and mature into silk moths so that they can lay eggs to produce more silkworms.

There is a variety of silk moths which look very different from one another and the silk yarn they yield is different in texture (coarse, smooth, shiny, etc). Thus, tassar silk, kosa silk, mooga silk, etc are obtained from cocoons spun by different types of moths. The most common silk moth is the mulberry silk moth. The silk obtained from the cocoons of mulberry silk moth is called mulberry silk. Mulberry silk is soft, lustrous (shiny) and elastic and can be dyed in beautiful colours.

Take a thread of pure silk and another thread of an artificial (synthetic) silk. Burn them separately and observe the smell produced. The thread which burns giving a smell of burning hair will be pure silk thread. The thread which burns giving a smell of burning paper will be artificial silk thread.

Question 3.
How silkworms are reared? Explain in brief.
Answer:
Pure and Artificial Silk
Pure silk is obtained from the cocoons of silkworm and it is made up of protein. Artificial silk is obtained from wood pulp and it is made of modified plant material ‘cellulose’. Just like silk, wool is also made up of proteins. So, a piece of woollen fabric also burns giving the smell of burning hair. The thread which burns giving a smell of burning paper will be cotton fibres. Cotton and paper both are carbohydrates. Paper is made of cellulose obtained from wood pulp. So, on burning cotton and paper both give similar smell.
Fibre to Fabric Class 7 Extra Questions Science Chapter 3 lo Q 3
From Cocoon to Silk
For obtaining silk, silk moths are reared and their cocoons are collected to get silk thread.

Rearing Silkworms
A female silk moth lays hundred of eggs at a time. The eggs are stored carefully on strips of paper or cloth and sold to silkworm farmers. The farmers keep eggs under hygienic condition. They warm them to a suitable temperature for the larvae to hatch from egg.

The larvae are kept in clean bamboo trays along with young and freshly chopped mulberry leaves. After 25-30 days, the silkworms stop eating and start spinning the cocoons. Small racks or twigs may be provided in the trays to which cocoons get attached.

Processing Silk
The cocoons are collected and boiled in water to kill the insect inside them. The resulting fibre is known as raw silk. The silk fibres separate out.

Reeling the Silk
The process of taking out fibres from the cocoon for use as silk is known as reeling the silk. Reeling is done in special machines. Silk fibres are spun into silk threads which are woven into silk cloth by weavers.

Question 4.
Explain the phrase – ‘Unity is Strength’ on the basis of the making of fabric from fibre. [NCERT Exemplar; HOTS]
Answer:
Fibres and fabric play a large role in everyday applications. A fibre is a hair-like strand of material. They are the smallest visible unit of a fabric and denoted by being extremely long in relation to their width. Fibres can be spun into yarn and made into fabric. A single fibre is too weak to break but when it once made a fabric it is difficult to tear. Fabric needs more energy to tear apart as compared to a single fibre.

Question 5.
Write various steps for processing fibres into wool. [NCERT Exemplar]
Answer:
Processing of Fibres into Wool
The wool which is used for knitting sweaters or for weaving shawls is the finished product of a long process. Processing of fibres into wool involves the following steps:

Step I
The fleece of the sheep along with thin layer of skin is removed from the body. This process is called shearing. The hair of the sheep are shaved off by using a saving machine similar to that used by barbers.
Shearing does not hurt the sheep because the uppermost layer of the skin of sheep is ‘dead’. The shearing (cutting the hair) of sheep is done in hot weather of summer so that sheep may survive without their protective coat of hair. The hair of sheep grow again before the onset of winter and protect them in cold weather. The fleece (or hair) of sheep provides woollen fibres. Woollen fibres are then processed to obtained woollen yarn.

Step II
The fleece of sheep (or cut hair of sheep) contains dust, dirt, dried sweat and grease, etc. So, the sheared hair of sheep are thoroughly cleaned by washing with soap (or detergent) and a lot of water in tanks. This process of washing of sheared hair is called scouring. Scouring makes the fleece of sheep clean. The scoured fleece is then dried. Now-a-days scouring is done by machines.

Step III
After scouring, sorting is done. The process of separating the fleece of a sheep into sections according to the quality of woollen fibres (such as fine, coarse, long, short, etc) is called sorting. In sorting, the hairy skin is sent to a factory where hair of different textures are separated or sorted. Every section of wool obtained after sorting contains the same quality wool. The same quality wool obtained are then mixed together.

Step IV
The small fluffy fibres, called burrs, are picked out from the hair (burrs are soft, fluffy fibres in wool).
(After this, the fibres are scoured again and dried. The wool obtained after this is ready to be drawn into fibres).

Step V
The natural fleece or hair of sheep (or goat) is white, brown or black in colour. The white woollen fibre obtained by sorting can be dyed in different colours.

Step VI
The fibres are straightened, combed and rolled into yarn. The long woollen fibres are spun (or twisted) into thick yarn called wool which is used for knitting sweaters, etc.
The short woollen fibres are spun into fine yarn and then woven on a loom to make woollen clothes (like shawls, etc).
Finally, we conclude that the sheep’s hair is sheared off from the body, scoured, sorted, dyed, combed and spun to obtain wool (for knitting sweaters) and woollen yarn (for weaving cloth). The quality of woollen cloth depends on the breed of sheep from which wool is obtained.
Fibre to Fabric Class 7 Extra Questions Science Chapter 3 lo Q 4

Question 6.
Neha went to the market with her mother to buy a silk saree for her grandmother. The shopkeeper was showing sarees of different varieties of silk but her mother wanted to take only a pure silk saree and not an artificial one. Neha was confused that how to distinguish between a pure silk and an artificial silk saree. But her mother helped her in selecting a pure silk saree for her grandmother and she was quite elated about that.
Now, answer the following questions:
(a) How her mother distinguished between pure silk saree and an artificial silk saree?
(b) Is the pure silk saree more costly than an artificial one?
(c) What values are shown by Neha’s mother? [Value Based Question]
Answer:
(a) Neha’s mother took a thread of natural silk fabric and another thread of artificial silk fabric and burn them separately. The thread which burns giving a smell of burning hair will be natural silk (or pure silk). The thread which burns giving a smell a burning paper will be an artificial silk.
(b) Yes, pure silk saree is more costly than an artificial one.
(c) Neha’s mother is intelligent and knowledgeable.

Question 7.
Ajay’s father works in a wool industry. In his line of work, he does the job of sorting the fleece of sheep into fibres of different qualities. Ajay noticed that his father and other workers who were doing the similar kind of jobs faced a number of health problems.
Ajay discussed this problem with his friends and he came to know that his father is getting health problems due to the nature of his work.
Ajay is worried about his father’s health. He advised his father to take care of their health and told him about the occupational hazards.
Now answer the following questions.
(a) What do you mean by occupational hazard?
(b) Name the disease that workers may at risk.
(c) What values are shown by Ajay? [Value Based Question]
Answer:
(a) The risks faced by people working in any industry due to the nature of their work are called occupational hazards.
(b) The people who do the job of sorting, sometimes, get infected by the bacteria called anthrax which cause a deadly blood disease called sorter’s disease.
(c) Ajay is very caring, intelligent and sensible boy.

Question 8.
Name some breeds of sheep reared in our country. Explain the quality of wool they provide and the state where they are found.
Answer:

Name of breed of sheep Quality of wool Name of the state where found
Lohi Good quality wool Rajasthan, Punjab
Rampur bushair Brown fleece Uttar Pradesh, Himachal Pradesh
Nali Carpet wool Rajasthan, Haryana, Punjab
Bakharwal For woollen shawls Jammu and Kashmir
Marwari Coarse wool Gujarat
Patanwadi For hosiery Gujarat

Nutrition in Animals Class 7 Science Extra Questions Miscellaneous

Multiple Choice Questions

Question 1.
The rearing of silkworms for obtaining silk is called [NCERT Exemplar]
(a) cocoon
(b) silk
(c) sericulture
(d) silviculture
Answer:
(c) sericulture

Question 2.
Which of the following is not a type of silk?
(a) Mulberry silk
(b) Tassar silk
(c) Mooga silk
(d) Moth silk
Answer:
(d) Moth silk

Question 3.
Paheli wanted to buy a gift made of animal fibre obtained without killing the animal. Which of the following would be the right gift for her to buy?
(a) Woollen shawl
(b) Silk scarf
(c) Animal fur cap
(d) Leather jacket
Answer:
(a) Woollen shawl

Question 4.
Silk fibre is obtained from [NCERT Exemplar]
(a) fleece of sheep
(b) cotton ball
(c) cocoon
(d) shiny jute stalk
Answer:
(c) cocoon

Question 5.
Wool fibre cannot be obtained from which of the following? [NCERT Exemplar]
(a) Goat
(b) Llama
(c) Alpaca
(d) Moth
Answer:
(d) Moth

Question 6.
Selective breeding is a process of
(a) selecting the offsprings with desired properties
(b) selecting the parents with desired properties
(c) selecting an area for breeding
(d) selecting fine hair for good quality wool
Answer:
(b) selecting the parents with desired properties

Question 7.
The general process that takes place at a sheep shearing shed is
(a) removal of fleece
(b) separating hair of different textures
(c) washing of sheep fibre to remove grease
(d) rolling of sheep fibre into yarn
Answer:
(a) removal of fleece

Question 8.
The term sericulture is used for [NCERT Exemplar]
(a) culture of bacteria
(b) rearing of silkworm
(c) making silk fabric from silk yarn
(d) production of sarees .
Answer:
(b) rearing of silkworm

Question 9.
Reeling of silk is
(a) a process of making silk reels
(b) spinning of silk fibres
(c) weaving of silk cloth
(d) the process of taking silk threads from cocoon
Answer:
(d) the process of taking silk threads from cocoon

Question 10.
Silkworms secrete fibre made of
(a) fat
(b) cellulose
(c) protein
(d) nylon
Answer:
(c) protein

Fill in the Blanks

Question 1 .
…… and ……. fibres are obtained from animals. [NCERT Exemplar]
Answer:
Silk, wool

Question 2.
Silk fibres come from of silk …….. [NCERT Exemplar]
Answer:
cocoons, moth

Question 3.
Wool yielding animals bear …….. on their body.
Answer:
hair

Question 4.
Hair trap a lot of …… which is a poor …… of heat.
Answer:
air, conductor

Question 5.
Silkworms are ……. of silk moth. [NCERT Exemplar]
Answer:
larvae

Question 6.
Silkworms spin …… of silk fibre.
Answer:
cocoons

Question 7.
Lohi and nali are breeds of
Answer:
cocoons

Question 8.
Wool has ……. tensile strength.
Answer:
high

Question 9.
Wool dissolves in and
Answer:
acids and bases

Question 10.
The sleeping period of silkworm is …… hours at intervals of about six days.
Answer:
24

Question 11.
The quality and quantity of wool depend upon the ……… of the sheep.
Answer:
breed

Question 12.
A ……. is a long continuous thread.
Answer:
yarn

Question 13.
…….. is the largest producer of silk.
Answer:
China

Question 14.
Silk is a …… conductor of heat.
Answer:
poor

Question 15.
Silk fibres are made up of a …….
Answer:
protein

True/False

Question 1.
Silkworms are caterpillars of silk moth.
Answer:
True

Question 2.
In India, camels and goats are generally reared for obtaining wool. [NCERT Exemplar]
Answer:
False, generally sheep are reared.

Question 3.
The rearing of silkworms for obtaining silk is called silviculture.
Answer:
False, it is sericulture.

Question 4.
In the process of obtaining wool from fleece, sorting is done after scouring. [NCERT Exemplar]
Answer:
True

Question 5.
Yak hair are not used to make woollen fabric.
Answer:
False, yak hair are used to make woollen fabric.

Question 6.
The angora rabbit yields best variety of wool
Answer:
True

Question 7.
Like wool, silk also keeps us warm as it is a bad conductor of heat.
Answer:
True

Question 8.
Silk is a natural carbohydrate fibre.
Answer:
False, silk fibre is made up of a protein.

Question 9.
Silkworm feeds on oak leaves.
Answer:
False, because silkworms feed on mulberry leaves.

Question 10.
Mooga is the strongest variety of wool.
Answer:
False, because mooga is the strongest variety of silk.

Match the Columns

Question 1.
Match the items of Column I with the items given in Column I [NCERT Exemplar]

Column I Column II
(a) Yak wool (i) Sheared hair
(b) Angora goats (ii) Silkworm
(c) Mulberry leaves (iii) Tibet and Ladakh
(d) Scouring (iv) Jammu and Kashmir

Answers:
(a)-(iii); (b)-(iv); (c)-(ii); (d)-(i)

Question 2.
Match Column I with Column II.

Column I Column II
(a) Sheep (i) Pashmina
(b) Camel (ii) Rearing of silkworm to get silk
(c) Kashmiri goat (iii) Wool
(d) Sericulture (iv) Fur

Answers:
(a)-(iii); (b)-(iv); (c)-(i); (d)-(ii)

Question 3.
A wholesale woollen fibre dealer gets the woollen fibre of different textures sorted for various purposes. Match the items in Column I with the woollen fibre in Column II.

column I column II
(a) Pashmina shawl (i) Camel wool
(b) Woollen carpet (ii) Angora wool
(c) Baby blanket (iii) Kashmiri goat
(d) Woollen sweater (iv) Sheep wool

Answers:
(a)-(iii); (b)-(i); (c)-(ii); (d)-(iv)

Nutrition in Animals Class 7 Extra Questions Science Chapter 2

Extra Questions for Class 7 Science PDF are provided here. Students can download the pdf of these solutions from the given links. Nutrition in Animals Class 7 Extra Questions Science Chapter 2 provided in accordance with the latest syllabus of CBSE which, in turn, help the students to build a strong foundation and secure excellent marks in their board exams. https://meritbatch.com/nutrition-in-animals-class-7-extra-questions/

Nutrition in Animals Class 7 Extra Questions Science Chapter 2

Nutrition in Animals Class 7 Science Extra Questions Very Short Answer Type

Class 7 Science Chapter 2 Extra Questions Question 1.
What is the total number of teeth in an adult human?
Answer:
In an adult human, there are total 32 teeth.

Nutrition In Animals Class 7 Extra Questions And Answers Question 2.
Name the parts of the alimentary canal where
(a) water gets absorbed from undigested food
(b) digested food gets absorbed
(c) taste of the food is perceived
(d) bile juice is produced [NCERT Exemplar]
Answer:
(a) large intestine
(b) small intestine
(c) tongue
(d) liver

Ncert Solutions For Class 7 Science Chapter 2 Extra Questions Question 3.
Identify the location of salivary gland.
Answer:
Salivary gland is present in the buccal cavity and it secretes saliva.

Nutrition In Animals Class 7 Extra Questions With Answers Question 4.
You were blindfolded and asked to identify the drinks provided in two different glasses. You could identify drink A as lime juice and B as bitter gourd juice. How could you do it inspite of being blindfolded? [NCERT Exemplar; HOTS]
Answer:
Inspite of being blindfolded, one could identify two different drinks with the help of taste buds present in the tongue.

Class 7 Science Chapter 2 Important Questions Question 5.
We should not eat hurriedly. Give reason.
Answer:
We should not eat hurriedly because if we ingest food in hurry or we talk or laugh while eating we experience hiccups, coughing or choking sensation.

Class 7 Science Chapter 2 Extra Questions Answers Question 6.
Name the secretions of stomach which digest food.
Answer:
The inner lining of stomach secretes mucous hydrochloric acid and digestive juices.

Class 7 Science Chapter 2 Extra Question Answer Question 7.
Explain the role of mucus secreted by stomach.
Answer:
The function of mucus is to protect the lining of stomach from the action of hydrochloric acid secreted by stomach lining.

Class 7 Science Ch 2 Extra Questions Question 8.
The long structure of small intestine is accommodated in small space within our body. Comment. [HOTS]
Answer:
The small intestine is about 7.5 metre long It is accommodated in a coiled form inside our body.

Nutrition In Animals Class 7 Worksheet With Answers Question 9.
Suggest the organ of digestive system where the digestive juices from liver and pancreas is poured.
Answer:
The digestive juices from liver and pancreas is poured into small intestine which helps in complete digestion and absorption of food.

Ncert Class 7 Science Chapter 2 Extra Questions Question 10.
From which organ of digestive system, the undigested faecal matter is removed?
Answer:
The undigested faecal matter is removed through the anus by the process called egestion.

Nutrition In Animals Extra Questions Question 11.
Mention the position of the rumen in ruminants.
Answer:
The rumen is the sac-like structure which is present between small intestine and large intestine in ruminants.

Nutrition In Animals Class 7 Questions And Answers Question 12.
What is assimilation?
Answer:
The process by which absorbed food is taken by body cells and is used for energy, growth and repair is called assimilation.

Nutrition In Animals Class 7 Worksheet Question 13.
Describe alimentary canal briefly.
Answer:
Alimentary canal is the tube running from mouth to anus of human and animals here digestion and absorption of food take place.

Ch 2 Science Class 7 Extra Questions Question 14.
Name the simple forms of carbohydrates, fats and proteins.
Answer:
The food components and their simple forms are carbohydrates (glucose), fatty (fats) acids and glycerol, proteins (amino acids).

Chapter 2 Science Class 7 Extra Questions Question 15.
Write the shape of stomach.
Answer:
The shape of stomach is like flattened U-shaped.

Class 7 Chapter 2 Science Extra Questions Question 16.
Discuss the role of hydrochloric acid secreted by gastric glands.
Answer:
It helps in the breakdown of food particles. It creates an acidic environment which facilitates the action

Nutrition in Animals Class 7 Science Extra Questions Short Answer Type

Extra Questions For Class 7 Science Ch 2 Question 1.
With the help of labelled diagram show the gradual decay of tooth.
Answer:
Sweets and Tooth Decay The tooth is covered by white, hard outer covering of tooth called Enamel enamel below which dentine is present. It is similar to bone which Pulp cavity (with nerves and blood vessels) protects the pulp cavity having nerves and blood vessels. Bacteria are Gum present in our mouth but they are not harmful to us. However, if we do not clean our teeth and mouth after eating, many harmful bacteria also begin to live and grow in it. These bacteria breakdown the sugars present from the leftover food and release acids. The acids gradually damage the tooth. This is called tooth decay.

Therefore, tooth decay is defined as the process of rotting of tooth and formation of cavity or holes in it which leads to the toothache.
When the holes or cavity reaches to the pulp cavity, it causes pain. If these cavities are not treated on time it causes severe toothache and may result in tooth loss.
Extra Questions For Class 7 Science Chapter 2
Tooth decay can be prevented by adapting following measures.
(i) One should rinse and clean its teeth thoroughly after every Pulp cavity meal.
(ii) We should clean our teeth with the help of datun or brush Gradual decaying of human tooth and toothpaste, twice a day.
(iii) We should use dental floss which is a special strong thread. It is moved between two teeth to take out
trapped food particles.
(iv) Dirty fingers or unwashed objects must be avoided to put in the mouth.
(v) We should avoid the use of sweets, chocolates, toffees, ice-cream, etc. Much use of cold drink should also be avoided.”

Science Class 7 Chapter 2 Extra Questions Question 2.
Name the various components of food and their simpler forms.
Answer:
The various components of food and their simpler forms are

Components of food Simpler form
Carbohydrate Glucose
Fats Fatty acids and glycerol
Proteins Amino acids
Vitamins Vitamins
Minerals and water Minerals and water

Class 7 Nutrition In Animals Extra Questions Question 3.
‘A’ got her gall bladder removed surgically as she was diagnosed with stones in her gall bladder. After the surgery, she faced problems in digestion of certain food items when consumed in bulk. Can you tell which kind of food items would they be and why? [NCERT Exemplar; HOTS]
Answer:
After surgical removal of gall bladder, ‘A’ would face problems in digestion of fat and fatty substances when consumed in bulk. This is because the bile juice stored in the gall bladder helps in digestion of fats.

Science Chapter 2 Class 7 Extra Questions Question 4.
Discuss the various associated glands of digestive system and their role in digestion.
Answer:
The various associated glands of digestive system and their role in digestion are as follows

  1. Salivary gland digestion of starch in mouth.
  2. Liver secretes bile juices which help in the digestion of fats.
  3. Pancreas secretes pancreatic juices which act on carbohydrate, fats and proteins and change them into simpler compounds.

Class 7th Science Chapter 2 Extra Questions Question 5.
Boojho took some grains of boiled rice in test tube ‘A’ and Paheli took boiled and chewed rice in test tube ‘S’. Both of them poured 1-2 drops of iodine solution into the test tube and observed the colour change. What colour change would they have observed? Give reasons for your Answer: [NCERT Exemplar; HOTS]
Answer:
In test tube A, blue black colour appeared because of presence of starch.
In test tube 6, colour of iodine will not change because of digestion of starch into sugars by the action of saliva in our mouth.

Extra Questions On Nutrition In Animals Class 7 Question 6.
Mention the different steps of nutrition in animals.

Nutrition In Animals Class 7 Worksheet With Answers Ncert Question 7.
List the preventive measures that one should adopt for avoiding tooth decay.
Answer:
Sweets and Tooth Decay The tooth is covered by white, hard outer covering of tooth called Enamel enamel below which dentine is present. It is similar to bone which Pulp cavity (with nerves and blood vessels) protects the pulp cavity having nerves and blood vessels. Bacteria are Gum present in our mouth but they are not harmful to us. However, if we do not clean our teeth and mouth after eating, many harmful bacteria also begin to live and grow in it. These bacteria breakdown the sugars present from the leftover food and release acids. The acids gradually damage the tooth. This is called tooth decay.

Therefore, tooth decay is defined as the process of rotting of tooth and formation of cavity or holes in it which leads to the toothache.
When the holes or cavity reaches to the pulp cavity, it causes pain. If these cavities are not treated on time it causes severe toothache and may result in tooth loss.
Nutrition in Animals Class 7 Extra Questions Science Chapter 2 sh Q 7
Tooth decay can be prevented by adapting following measures.
(i) One should rinse and clean its teeth thoroughly after every Pulp cavity meal.
(ii) We should clean our teeth with the help of datun or brush Gradual decaying of human tooth and toothpaste, twice a day.
(iii) We should use dental floss which is a special strong thread. It is moved between two teeth to take out
trapped food particles.
(iv) Dirty fingers or unwashed objects must be avoided to put in the mouth.
(v) We should avoid the use of sweets, chocolates, toffees, ice-cream, etc. Much use of cold drink should also be avoided.”

Question 8.
Write the difference between milk teeth and permanent teeth.
Answer:
The difference between milk teeth and permanent teeth are

Milk teeth Permanent teeth
They grow during infancy, i.e. when one is small baby. They grow at the age of 6-8 years.
They are also called as temporary teeth because these are lost at the age of 6-8 years. They do not fall till the old age.
They can be replaced by permanent teeth. If these teeth fall down no new teeth arises on its place.

Question 9.
Complete the following table, from the options given below:
(Scraping, chewing, siphoning, capturing and swallowing, sponging, sucking, etc.)

Name of animal Kind of animal Mode of feeding
Snail
Ant
Eagle
Humming bird
Lice
Mosquito
Butterfly
Housefly

Answer:
The complete table is

Name of animal Kind of food Mode of feeding
Snail Leaves and insects Scraping
Ant Food particles Chewing
Eagle Small animals Capturing and swallowing
Humming bird Nectar of flower Sucking
Lice Blood Sucking
Mosquito Blood Sucking
Butterfly Nactar of flower Siphoning
Housefly All most everything Sponging

Question 10.
Briefly describe the mechanism of producing hiccups while we take food in hurry.

Question 11.
Boojho and Paheli were eating their food hurriedly so that they could go out and play during the recess. Suddenly, Boojho started coughing violently. Think of the reasons, why he was coughing and discuss with your friends?
[NCERT Exemplar; HOTS]
Answer:
Sometimes when we eat hurriedly, talks or laughs while eating, the flap-like valve (called epiglottis) which closes the passage of windpipe remains open. Therefore, the food may enter into the windpipe. Coughing helps to clear the passage and returns the food particle back to the foodpipe.

Question 12.
Gastric glands in stomach release hydrochloric acid, enzyme pepsin and mucus. What will happen if mucus is not secreted by the gastric glands?
Answer:
Mucus protects the inner lining of stomach form the action of hydrochloric acid and enzyme pepsin. If mucus is not released, it will lead to erosion of inner lining of stomach leading to acidity and ulcers.

Question 13.
Choose the odd one out from each group and give reasons.
(a) liver, salivary gland, starch, gall bladder
(b) stomach, liver, pancreas, salivary gland
(c) tongue, absorption, taste, swallow
(d) oesophagus, small intestine, large intestine, rectum [NCERT Exemplar]
Answer:
(a) Starch, because rest all are glands and starch is a type of carbohydrate.
(b) Stomach, because rest all are digestive glands and stomach is a digestive organ.
(c) Tongue, because rest all are digestive processes and tongue is a part of digestive system.
(d) Small intestine, because it carriers the process of digestion and rest are not involved in digestion.

Question 14.
Following statements describe the five steps in animal nutrition. Read each statement and give one word for each statement. Write the terms that describe each process.
(a) Transportation of absorbed food to different parts of body and their utilisation.
(b) Breaking of complex food substances into simpler and soluble substances.
(c) Removal of undigested and unabsorbed solid residues of food from the body.
(d) Taking food into the body.
(e) Transport of digested and soluble food from the intestine to blood vessels.[NCERT Exemplar]
Answer:
(a) Assimilation
(b) Digestion
(c) Egestion
(d) Ingestion
(e) Absorption

Question 15.
Small intestine in herbivores is longer than in carnivores. Do you agree? Support your Answer:
Answer:
Yes, carnivores animals cannot digest cellulose, hence they have a shorter small intestine. In herbivores, digestion of cellulose takes a longer time. Hence, herbivores need a longer small intestine to allow complete digestion of cellulose.

Question 16.
Draw a neat and clean diagram of Amoeba showing the correct location of the following components : nucleus, vacuole, pseudopodia.
Answer:
Nutrition in Animals Class 7 Extra Questions Science Chapter 2 sh Q 16

Question 17.
Draw the labelled diagram of tongue showing different region for taste buds.
Answer:
Refer to figure on page 17.
Nutrition in Animals Class 7 Extra Questions Science Chapter 2 sh Q 17

Question 18.
Ruminants such as cows and buffaloes swallow their food hurriedly and then sit restfully and chew their food. Give reason. [NCERT Examplar; HOTS]
Answer:
Ruminants such as cows and buffaloes swallow their food hurriedly and store it in a part of the stomach called rumen. The cellulose of the food is digested here by the action of certain bacteria which are not present in humans. Later, this partially digested food is returned to the buccal cavity of the animals in small lumps and animal chews it to complete the process of digestion. This process is called rumination.

Question 19.
Discuss the position and number of molars in buccal cavity.
Answer:
Molars are very large teeth which are present behind the premolar, towards the back of our mouth. They are only present in the permanent set of teeth and are 6 in each jaw.

Question 20.
Name the three digestive glands in our body.
Answer:
The three digestive glands are

  1. liver
  2. Pancreas
  3. Salivary glands

Question 21.
The swallowed food moves downwards in the alimentary canal. Explain.
Answer:
The swallowed food moves downwards in the alimentary canal because of the atternate relaxation contraction movement of muscles in the wall of foodpipe called peristalsis.

Question 22.
Explain how assimilation is different from absorption.
Answer:
The process by which nutrients from the digested food are absorbed by the body is called absorption whereas the process by which the absorbed nutrients are utilised by the body for providing energy is called assimilation.

Question 23.
Food moves in the opposite direction during vomiting. How?
Answer:
The intense pressure is formed in the stomach when the food is not accepted by the stomach. The content in the stomach is then pushed back. This returned content is expelled out from the mouth in the form of vomiting.

Question 24.
Briefly explain, why animals like cow cannot chew their food properly at the time they take it in.
Answer:
Animals like cow cannot chew their food properly due to the presence of cellulose in their diet. At the time they take in food, the food is moistend and is sent for cellulose digestion and softening in rumen.

Question 25.
Is there any role of liver in digestion of fats? Explain.
Answer:
Yes, liver produces bile which has bile salts. These salts break large fat molecules to fine droplets. These fine droplets are further converted into fatty acids and glycerol.

Question 26.
Cellulose rich food substances are good source of roughage in human beings. Justify. [HOTS]
Answer:
Cellulose rich food substances are good source of roughage in human beings. It is because the cellulose digesting bacteria are not present in the body of human beings due to which human beings cannot digest cellulose (present in plant foods).

Question 27.
Recall and name the main organs of the digestive system in our body.
Answer:
The different organs of the alimentary canal are as follows :

  1. Mouth and mouth cavity
  2. Oesophagus
  3. Stomach
  4. Small intestine
  5. Large intestine
  6. Anus

Question 28.
Alimentary canal is different from digestive system. Comment.
Answer:
Alimentary canal is a long, muscular coiled tube. It is also known as digestive tract. The alimentary canal with its associated glands constitute the digestive system. These glands are salivary glands, liver and pancreas.

Question 29.
Windpipe runs adjacent to the foodpipe. What will happen if food particles enter the windpipe? Explain.
Answer:
The windpipe carries air from the nostrils to the lungs. It runs adjacent to the foodpipe. If, by chance, food particles enter the windpipe, we feel choked, get hiccups or cough.

Question 30.
Explain how is small intestine designed to absorb digested food.
Answer:
The finger-like projections called villi are present in the inner walls of the small intestine. The villi increase the surface area. The large surface area of small intestine helps in the rapid absorption of the digested food.

Nutrition in Animals Class 7 Science Extra Questions Long Answer Type

Question 1.
Label the given figure as directed below in A to D and give the name of each type of teeth.
(a) The cutting and biting teeth as A
(b) The piercing and tearing teeth as B
(c) The grinding and chewing teeth as C
(d) The grinding teeth present only in adult as D
Nutrition in Animals Class 7 Extra Questions Science Chapter 2 lo Q 1
Answer:
Nutrition in Animals Class 7 Extra Questions Science Chapter 2 lo Q 1.1

Question 2.
Briefly describe the process of digestion in Amoeba with the help of labelled diagram. [NCERT Examplar]
Answer:
Feeding and Digestion in Amoeba

Amoeba is a microscopic single celled organism, which is found in pond water. It is a very simple animal and cannot be seen by naked eyes. Amoeba has a cell membrane, a rounded dense nucleus and many small bubble-like vacuoles in its cytoplasm. These vacuoles are of two types, i.e. food vacuole and contractile vacuole. Food vacuole contains food surrounded by water while contractile vacuole contains liquid or water and controls water regulation activity in Amoeba. Its shape is not fixed, i.e. it constantly changes its shape and position. The body of Amoeba has finger-like projections, called pseudopodia or false feet. It captures food and helps in locomotion of Amoeba.
Nutrition in Animals Class 7 Extra Questions Science Chapter 2 lo Q 2
The food of Amoeba are microscopic organisms like tiny plants and animals present in pond water. When Amoeba senses its food, it pushes out pseudopodia around the food particle and engulfs it. The two pseudopodia join around the food particle and trap the food particle with a little water forming vacuole around food, thus the food gets trapped. Digestive juices present inside the vacuole, acts on the food and break it into simpler substances. This digested food is then absorbed and is used for growth, maintenance and multiplication of Amoeba. The undigested food residue is expelled outside by the vacuole. The basic process of digestion of food and release of energy is as similar to the other organisms.

Question 3.
Label the following parts of above figure and name them.
(a) The largest gland in our body.
(b) The organ where protein digestion starts.
(c) The organ that releases digestive juice into the small intestine.
(d) The organ where bile juice gets stored. [NCERT Examplar]
Nutrition in Animals Class 7 Extra Questions Science Chapter 2 lo Q 3
Answer:
Nutrition in Animals Class 7 Extra Questions Science Chapter 2 lo Q 3.1

Question 4.
Little Rishi (student of class VI) was watching his favourite cartoon serial on television. Suddenly he got hiccups. His elder brother Shubham who was sitting near by him gave him a glass of water and suggested not to eat too fast in a hurry. Little Rishi got confused as he had heard that ‘hicki’ comes when someone remembers. He asked his father. His father smiled and explained him that it is only a myth. He also explained him the proper scientific reason behind it.
(a) What is hiccup?
(b) Why do we get hiccup?
(c) What are the values shown by Rishi? [Value Based Question]
Answer:
(a) Hiccup is a choking sensation that produces a characteristic gulping sound repeatedly. It is called ‘hicki’ in our local language.
(b) Sometimes, when we eat too fast in a hurry or talk too much or laugh while eating, then a little of windpipe remains open due to which food particles may enter the windpipe. It may result in a choking sensation called hiccups.
(c) He is sincere and curious to know about the things at an early age.

Question 5.
Jaya returned from school and found that grandmother was scolding her maid, Rani as she did not come yesterday. The maid told that his son was passing watery stools frequently that’s why she didn’t come. Jaya’s mother who was listening the discussion came to them and told Rani not to come for coming 3-4 days. She also suggested her to give his son a solution of sugar and salt in clean water, many times a day for fast recovery. Jaya was surprised. She rushed to her mother and asked the scientific reason for it. Her mother smiled and explained her the importance of this solution.
(a) Name the term used to describe the condition in which a person passes out watery stools.
(b) Name the solution of sugar and salt in water. Why is it given to a person suffering from diarrhoea?
(c) What are the values shown by Jaya? [Value Based Question]
Answer:
(a) Diarrhoea.
(b) Oral Rehydration Solution (ORS). It is given to a person suffering from diarrhoea to prevent the dehydration.
(c) She is sincere, curious and has interest in science.

Question 6.
Read the following passage carefully and answer the questions that follow it.
Bile juice is stored in a sac called, gall bladder, located near its organ of secretion, liver. The gall bladder releases the bile juice into the small intestine whenever food reaches there. Though bile juice is devoid of any digestive enzymes, it is required for the digestion of fats. The fats cannot be digested easily because they are insoluble in water and are present as large globules. Bile juice breaks down big fat droplets into smaller droplets. These are then easily digested by the enzymes released from the pancreas
(a) Which organ secretes the bile juice?
(b) Why is digestion of fats difficult as compared to that of other nutrients?
(c) How does bile juice help in digestion of that of other nutrients?
(d) Where is the digestion of fat completed?
(e) Does bile juice digest fat completely? [NCERT Exemplar]
Answer:
(a) Bile juice is secreted by liver.
(b) Digestion of fats is difficult as compared to that of other nutrients because of insolubility of fat in water.
(c) Bile juice helps in digestion of fat by breaking down big fat droplets into smaller droplet.
(d) Digestion of fat is completed in small intestine.
(e) No, fat is not completely digested by bile juice.

Question 7.
Define oral rehydration solution and when it is given to the patient? How can you prepare ORS at home?
Answer:
Oral rehydration solution is the solution of sugar and salt in a particular ratio in the clean water. When a person passes out watery stools frequently, the disease is called diarrhoea. In this condition there is a loss of water and salt from the body of a person.

This is called dehydration which may be fatal if not cured at proper time. In order to prevent dehydration, the person or patient should be given ORS. ORS makes up the loss of water and salts in the body and sugar provides energy which helps in the recovery of disease. It should be given to a patient suffering from diarrhoea at a regular interval.

At home the ORS can be prepared by dissolving a teaspoonful of sugar and pinch of salt in a glass of clean water. The water used for preparing ORS should be first boiled and then cooled so that all the microorganisms or harmful bacteria may be killed.

Question 8.
Open your mouth, look into a mirror and try to count the different types of teeth of teeth in your mouth. Compare them with figure 2.3 on page 13 of your NCERT textbook. Record your observations in the table below: [NCERT Exemplar]

Type of teeth Number of teeth
In my mouth In the figure
Incisors
Canines
Premolars
Molars

(a) Did you observe any difference in the number of teeth? If yes, could you identify which type of teeth showed the difference?
(b) Compare the number and type of teeth in an adult (say your parents or cousins who have reached the age of 25-30 or more). Note your observation.
Answer:

Type of teeth Number of teeth
In my mouth In the figure
Incisors 4 4
Canines 8 8
Premolars 8 8
Molars 8 12

(a) Yes, the difference has been observed in the number of molars.
(b) The number and type of teeth varries in an adult as compared to the child. Children have 28 teeth in their mouth.There are only four molars in each jaw.
While, adults have 32 teeth in their mouth which means six molars in each jaw.

Question 9.
Explain how the digestion of cellulose occurs in grass eating animals.
Answer:
Digestion in Grass-Eating Animals

The herbivorous animals such as cow, buffaloes, etc eat grass. These animals quickly swallow the grass and store it in a part of stomach called rumen. The food is not chewed completely. Rumen possess cellulose digesting bacteria which breakdown the food by fermentation. This partially digested food or grass present in the rumen of cow is called cud.

This cud is brought back into the mouth of the cow from the rumen into small lumps and animal chews it again. This process is called rumination and animals are called ruminants.
When this cud is thoroughly chewed in the mouth of the cow, it is swallowed again. This time the chewed cud does not go back to rumen but enter into the other compartments of cow’s stomach and then into the small intestine for complete digestion and absorption of food. The cellulose digesting bacteria are not present in the body of human being, therefore human beings and other carnivore cannot digest cellulose present in plant food items.

Nutrition in Animals Class 7 Science Extra Questions Miscellaneous

Multiple Choice Questions

Question 1.
Hydrochloric acid is secreted by
(a) linings of small intestine
(b) inner lining of stomach
(c) pancreas
(d) lining of liver
Answer:
(b) inner lining of stomach

Question 2.
Which of the following pair of teeth differ in structure but are similar in function? [NCERT Exemplar]
(a) Canines and incisors
(b) Molars and premolars
(c) Incisors and molars
(d) Premolars and canines
Answer:
(b) Molars and premolars

Question 3.
The swallowed food moves downwards in the alimentary canal because of [NCERT Exemplar]
(a) force provided by the muscular tongue
(b) the flow of water taken with the food
(c) gravitational pull
(d) the contraction of muscles in the wall of foodpipe
Answer:
(d) the contraction of muscles in the wall of foodpipe

Question 4.
The acid present in the stomach
(a) kills the harmful bacteria that may enter along with the food
(b) protects the stomach lining from harmful substances
(c) digests starch into simpler sugars
(d) makes the medium alkaline
Answer:
(a) kills the harmful bacteria that may enter along with the food

Question 5.
The simplest form of protein is
(a) fatty acids
(b) glucose
(c) glycerol
(d) amino acids
Answer:
(d) amino acids

Question 6.
The finger-like outgrowths of Amoeba helps to ingest food. However, the finger-like outgrowths of human intestine helps to [NCERT Exemplar]
(a) digest the fatty food substances
(b) make the food soluble
(c) absorb the digested food
(d) absorb the undigested food
Answer:
(c) absorb the digested food

Question 7.
The false feet of Amoeba are used for [NCERT Exemplar]
(a) movement only
(b) capture of food only
(c) capture of food and movement
(d) exchange of gases only
Answer:
(c) capture of food and movement

Question 8.
Read the following statements with reference to the villi of small intestine.
(i) They have very thin walls.
(ii) They have a network of thin and small blood vessels close to the surface.
(iii) They have small pores through which food can easily pass.
(iv) They are finger-like projections.
Identify those statements which enable the villi to absorb digested food.
(a) (i), (ii) and (iv)
(b) (ii), (iii) and (iv)
(c) (iii) and (iv)
(d) (i) and (iv)
Answer:
(c) (iii) and (iv)

Question 9.
The absorption of nutrients or food components in its simpler form takes place in
(a) blood vessels of small intestine wall
(b) large intestine wall
(c) gall bladder
(d) liver
Answer:
(a) blood vessels of small intestine wall

Question 10.
The enzymes present in the saliva convert [NCERT Exemplar]
(a) fats into fatty acids and glycerol
(b) starch into simple sugars
(c) proteins into amino acids
(d) complex sugars into simple sugars
Answer:
(b) starch into simple sugars

Question 11.
Cud is the name given to the food of ruminants which is [NCERT Exemplar]
(a) swallowed and undigested
(b) swallowed and partially digested
(c) properly chewed and partially digested
(d) properly chewed and completely digested
Answer:
(b) swallowed and partially digested

Question 12.
Cellulose rich food substances are good sources of roughage in human beings because [NCERT Exemplar]
(a) human beings do not have cellulose: digesting enzymes
(b) cellulose gets absorbed in the human blood and converts into fibres
(c) the cellulose digesting bacteria convert cellulose into fibres
(d) cellulose breaks down into smaller components which are egested as roughage
Answer:
(a) human beings do not have cellulose: digesting enzymes

Question 13.
If, by chance, food particles enter the windpipe, we feel
(a) hiccups and cough
(b) yawning
(c) sleep
(d) None of these
Answer:
(a) hiccups and cough

Question 14.
The tip or front of tongue taste
(a) sour
(b) bitter
(c) salt and sweet
(d) All of these
Answer:
(c) salt and sweet

Question 15.
Dentine protects which part of human teeth?
(a) Enamel
(b) Pulp cavity
(c) Gums
(d) Dental cavity
Answer:
(b) Pulp cavity

Question 16.
The finger-like projection presents on the inner lining of small intestine is called
(a) villi
(b) stomach
(c) rumen
(d) diarrhoea
Answer:
(a) villi

Fill in the Blanks

Question 1.
……. is the process of taking food inside the body.
Answer:
Ingestion

Question 2.
….. is the simplest form of carbohydrate.
Answer:
Glucose

Question 3.
The process of breakdown of complex food material into …… is called …….
Answer:
simpler form, digestion

Question 4.
Amoeba digests its food inside ………
Answer:
food vacuole

Question 5.
……. teeth replaces the milk teeth.
Answer:
Permanent

Question 6.
…… is the long tube-like structure which
Answer:
Alimentary canal

Question 7.
Large intestine absorbs ….. and …… from undigested food.
Answer:
water, salts

Question 8.
Animals are …….
Answer:
heterotrophic

Question 9.
Cud chewing animals are called ……..
Answer:
ruminants

Question 10.
Four kinds of teeth present in human are ……, …….., …….. and ……..
Answer:
incisor, cannines, premolar, molar

True/False

Question 1.
Oesophagus is also called as foodpipe.
Answer:
True

Question 2.
Simplest form of fat is sugars and glucose.
Answer:
False, simplest form of fat is fatty acid and glycerol.

Question 3.
Ruminant can digest cellulose (carbohydrate).
Answer:
True

Question 4.
Canines are used for grinding of food.
Answer:
False, canines are used for piercing and tearing the food.

Question 5.
Amoeba is a microscopic, single celled animal.
Answer:
True

Question 6.
The nutrition in Amoeba takes place by pseudopodia.
Answer:
True

Question 7.
Egestion is the process of removing waste food or undigested food through anus.
Answer:
True

Question 8.
Diarrhoea can be treated by only giving water to the patient.
Answer:
False, diarrhoea can be treated by giving a solution of sugar and salt in the clean water for several times in a day. This solution is called ORS.

Question 9.
Source of energy for living being is food.
Answer:
True

Question 10.
The digestion of starch only takes place in the stomach
Answer:
False, digestion of starch normally begins in the mouth where it is broken down into smaller sugar molecules, glucose. Additional breakdown of starch occurs in the small intestine.

Match the Columns

Question 1.
Match the Column I with Column II. [NCERT Examplar]

Column 1 Column II
(a) Rectum (i) Mucus
(b) Gallbladder (ii) Villi
(c) Stomach (iii) Taste buds
(d) Tongue (iv)Faecus
(e) Small intestine (v) Bile juice

Answers:
(a)-(v), (b)-(vi), (c)-(i), (d)-(vii), (e)-(ii), (f)-(iv), (g)-(iii)

Question 2.
Match the Column I with Column II.

Column 1 Column II
(a) Amoeba (i) ORS
(b) Incisors (ii) Bile juice storage
(c) Diarrhoea (iii) Release of faecus
(d) Fat (iv) Cud chewing animals
(e) Gall bladder (v) Pseudopodia
(f) Ruminants (vi) Cutting and biting
(g) Anus (vi) Fatty Acid and Glycerol

Answers:
(a)-(iii), (b)-(i), (c)-(iv), (d)-(ii)

NCERT Solutions for Class 6 English Honeysuckle Prose Chapter 6 Who I Am

NCERT Solutions for Class 6 English Chapter 6 Who I Am

NCERT Solutions for Class 6 English Chapter 6 Who I Am

Working With the Text   (Page 73)

Answer the following questions.

Q1. Peter’s favourite day of the week is Sunday because_______
Ans. ……. on this day the whole family goes to see a film.

Q2. Nasir wants to learn___________________
Ans. … Fr.e art of collecting cotton seeds.                             ‘

Q3.Dolma believes that she can make a good Prime Minister because____
Ans. ……. she hopes to make things better for everyone, to have great scientists and doctors, good hospitals and roads and schools.

B.Write True or False against each of the following statements.

1.Peter is an only child. _________________________ .
2.When Serbjit gets angry he shouts at people. _____________________________
3.Nasir lives in the city. _________________________
4.Radha’s mother enjoys doing things with her. ____________________________
Ans. 1. False;                        2. False;                 3. False;                    4. True.

NCERT SolutionsMathsScienceSocialEnglishHindiSanskritRD Sharma

NCERT Solutions for Class 6 Science Chapter 1 Food Where Does It Come From

NCERT Solutions for Class 6 Science Chapter 1 Food Where Does It Come From

NCERT Solutions for Class 6 Science Chapter 1 Food Where Does It Come From

The topics and Sub Topics in Class 6 Science Chapter 1 Food Where Does It Come From:

Section Name Topic Name
1 Food: Where Does it Come From?
1.1 Food Variety
1.2 Food Materials and Sources
1.3 Plant Parts and Animal Products as Food
1.4 Plant parts as food
1.5 What do Animals Eat?

Class 6 Science Chapter 1 Textbook Questions Solved

Q. 1. Do you find that all living beings need the same kind of food?
Ans. No, all living beings do not need same kind of food.

Q.2. Name five plants and their parts that we eat.
Ans. The names of five plants and their parts that we eat are:
(i) Paddy: seeds
(ii) Wheat: seeds
(iii) Mustard plant: seeds and leaves
(iv) Brinjal plant: fruits
(v) Potato plant: stems

Q. 3. Match the items given in column A with those in column B.
NCERT Solutions for Class 6 Science Chapter 1 Food Where Does It Come From Q3
Q. 4. Fill up the blanks with the words given:
herbivore, plant, milk, sugarcane, carnivore.
(a) Tiger is a__________ because it eats only meat.
(b) Deer eats only plant products and so is called______________ .
(c) Parrot eats only__________
(d) The_________ that we drink, which comes from cows, buffaloes and goats is
an animal product.
(e) We get sugar from___________ .
Ans. (a) carnivore                                   (b) herbivore                 (c) plant
(d) milk                                     (e) sugarcane

Extra Questions for Class 6 Science Chapter 1

Class 6 Science Chapter 1 VERY SHORT ANSWER TYPE QUESTIONS

Q. 1. Give two examples where two or more parts of a single plant are used as food.
Ans. Mustard — seeds and leaves,
Pumpkin — fruit and flowers.

Q.2. Name any one plant that grows in water and is eaten as food.
Ans. Lotus — Stem of lotus is eaten as food.

Q.3. Suggest any three ways you can think of to avoid wastage of food.
Ans. (i) Avoid leaving food uneaten in meals.
(ii) “Eat to live” and not “live to eat” — excess eating should be avoided.
(iii) Raw food like pulses, grains should be stored properly.

Q.4. Name two sugar producing plants.
Ans. (a) Sugarcane                                           (b) Sugarbeet.

Q.5. Name a non-green plant that we eat.
Ans. Mushroom.

Q.6. What do you call the habit of an individual to eat a particular type of food items commonly?
Ans. Food habit.

Q.7. Compare your food habits with food habits of your friend who lives in Tamil Nadu.
Ans. My food habit: Chapatti, pulses, lassi, rice, vegetables, mustard oil.
Food habit of my friend: Idli, dosa, sambhar, bara, rasam, upma and coconut oil, etc.

Q.8. What items are used to prepare cooked rice?
Ans. Raw rice and water.

Q.9. Study the ingredients of various food items. Do they have some common food ingredients?
Ans. Yes, they have some common ingredients like: water, salt and oil or ghee.

Q.10. What are the two common sources of most of the ingredients of food items?
Ans. (i) Plants                                                  (ii) Animals

Q.11. Name the three products each provided by plants and animals.
Ans. Plant products: Grains, cereals and vegetables.
Animal products: Milk, egg and meat.

Q.12. Name three edible (eatable) parts of plants.
Ans. (i) Roots                                        (ii) Fmits                                (iii) Leaves

Q.13. Which part of the plants do we eat generally?
Ans. We generally eat fruits of many plants.

Q. 14. Which type of seeds give more energy, sprouted seeds or normal seeds?
Ans. Sprouted seeds give more energy than normal seeds.

Q.15. What is honey? 
Ans. A sweet substance (liquid) prepared by bees from the riectar, i.e., sweet juice collected from flowers is called honey.

Q.16. Where would you place human beings on the basis of food that they eat?
Ans. Omnivores.

Class 6 Science Chapter 1 SHORT ANSWER TYPE QUESTIONS

Q.l. What is food?
Ans. The eatable substances eaten by humans and other animals to get energy for various activities for growth and development is called food.

Q.2. Why should we eat cooked food?
Ans. We should eat cooked food because by cooking we can kill harmful germs and make it germless. Cooked food can be easily digested and absorbed by our body. Cooking also improves the taste of food.

Q.3. Explain the importance of food for living organisms.
Ans. Importance of food is:
(i)  It provides energy to do various activities.
(ii) It helps in growth.
(iii) It helps to repair and replace damaged parts of the body.
(iv) It protects us from infections and diseases.

Q.4.  Explain the various sources of food items and ingredients with the help of examples.
Ans.  There are mainly two sources of ingredients of various food items:
(i) Plants: Plants provide us fruits, vegetables, pulses, grains, cereals, etc.
(ii) Animals: Animals provide us milk, eggs, meat etc.

Q.5. Define the term herbivores.
Ans. The animals which eat only plants or plant products are called herbivores. For example, cow, goat and buffalo.

Q.6. What are carnivores? Explain with examples.
Ans. The-animals which eat other animals are called carnivores. For example, lion and tiger. Carnivores generally eat herbivores and other carnivores.

Q.7. Define the term omnivores.
Ans. The animals which eat both the plants and animals are called omnivores. For example, cat, dog and human beings.

Class 6 Science Chapter 1 LONG ANSWER TYPE QUESTIONS

Q. 1. With the help of a flow chart show various contributors involved when we eat a chapatti.
NCERT Solutions for Class 6 Science Chapter 1 Food Where Does It Come From LAQ Q1

Q.2. Make flow charts for the preparation of honey and ghee.
Ans. Preparation of honey:
NCERT Solutions for Class 6 Science Chapter 1 Food Where Does It Come From LAQ Q2
Q. 3. Differentiate between herbivores, carnivores and omnivores. Give two examples of each
NCERT Solutions for Class 6 Science Chapter 1 Food Where Does It Come From LAQ Q3
Q. 4. (i) Name the different parts of a banana plant that are used as food.
(ii)  Animal food we get from water resources.
(iii) Four fruits which we eat as vegetables.
Ans. (i) Flower, fruit and stem of banana.
(ii) Fish, prawn, lobustar and crabes.
(iii) Fruits of tomato, brinjal, Ladyfinger (bhindi), cucumber (Loki).

NCERT Solutions

NCERT Solutions for Class 6 Science – All Chapters

NCERT Solutions for Class 6 Science Chapter 3 Fibre to Fabric

NCERT Solutions for Class 6 Science Chapter 3 Fibre to Fabric

Topics and Sub Topics in Class 6 Science Chapter 3 Fibre to Fabric:

Section Name Topic Name
3 Fibre to Fabric
3.1 Variety in Fabrics
3.2 Fibre
3.3 Some Plant Fibres
3.4 Spinning Cotton Yarn
3.5 Yarn to Fabric
3.6 History of clothing material

Class 6 Science Chapter 3 Textbook Questions Solved

Q.1. Classify the following fibres as natural or synthetic: nylon, wool, cotton, silk, polyester, jute.
Ans. Natural fibres: wool, cotton, jute, silk.
Synthetic fibres: nylon, polyester.

Q.2. State whether the following statements are ‘true’ or false’:
(a) Yam is made from fibres.
(b) Spinning is a process of making fibres.
(c) Jute is the outer covering of coconut.
(d) The process of removing seeds from cotton is called ginning.
(d) Weaving of yam makes a piece of fabric.
(e) Silk fibre is obtained from the stem of a plant.
(g) Polyester is a natural fibre.
Ans.
(a) True
(b) False
(c) False
(d) True
(e) True
(f) False
(g) False

Q.3. Fill in the blanks:
(a) Plant fibres are obtained from____________ and___________ .
(b) Animal fibres are___________ and___________ .
Ans.
(a) cotton plants, jute plants
(b) wool, silk

Q. 4. From which part of the plant cotton and jute are obtained?
Ans.
(i) Cotton – Cotton bolls (from the surface of cotton seeds) (fruit)
(ii) Jute – Stem

Q.5. Name two items that are made from coconut fibre.  
Ans.
(i) Ropes
(ii) Mats

Q.6. Explain the process of making yam from fibre.
Ans. Yarns are made up of thin strands called fibres. The process of making yam from fibres is called spinning. In this process, a mass of cotton wool are drawn out and twisted. This brings the fibres together to form yarn.

EXTRA QUESTIONS for Class 6 Science Chapter 3

Class 6 Science Chapter 3 VERY SHORT ANSWER TYPE QUESTIONS

Q.1. Name two varieties of cloth materials which are commonly used.
Ans. Cotton, silk/wool.

Q.2. What are fabrics?
Ans. Fabrics mean a woven material, textile or other materials resembling woven cloth.

Q.3. Name some fabrics in your surroundings.
Ans. Bed-sheets, blankets, curtains, table clothes, towels and dusters.

Q. 4.  Name the thing which is used to make fabric.
Ans. Yarns.

Q.5. What are yarns made of?
Ans. Yarns are made up of thin strands called fibres.

Q.6. How many types of fibres are there?                                                        ,
Ans. There are two types of fibres:
(i) Natural fibres
(ii) Synthetic fibres

Q.7. Name two natural fibres.
Ans. 
(i) Cotton
(ii) Jute

Q.8. Name two synthetic fibres.
Ans. 
(i) Polyester
(ii) Nylon

Q.9. What material you use for making wicks for oil lamps?
Ans. Cotton wool.

Q.10. Where does cotton wool come from.?
Ans. Cotton wool comes from cotton bolls.

Q.11. What are fruits of cotton plants called?
Ans. Cotton bolls.

Q.12. What type of soil is used to grow cotton plants?
Ans. Black soil.

Q.13. Define ginning of cotton.
Ans. The process of separating fibres from the seeds of cotton is called ginning of cotton.

Q.14. What is jute?
Ans. Jute is a fibre obtained from the stem of a jute plant.

Q.15. Name the states where jute plants are mainly grown in India.
Ans. West Bengal, Bihar and Assam.

Q.16. What is spinning?
Ans. The process of making yarns from fibres is called spinning.

Q.17. Name two hand-operated devices used for spinning.
Ans.
(i) Takli
(ii) Charkha

Q.18. How are fabrics prepared?
Ans. Fabrics are prepared from the yarns by weaving or knitting.

Q. 19. Name the process used to prepare fabrics from yams.
Ans. The processes which used to prepare fabrics are: (i) Weaving and (ii) Knitting.

Q.20. What is weaving?
Ans. The process of arranging two sets of yarns together to make a fabric is called weaving.

Q.21. What is knitting?
Ans. The process in which a single yarn is used to make a piece of fabric is called knitting.

Q.22. Name two methods of knitting.
Ans.
(i) By hands
(ii) By machines

Q.23. Where were the cotton and flax plants cultivated in ancient Egypt?
Ans. Cotton and flax plants were cultivated near the river Nile in ancient Egypt.

Q.24. Name some modem fabrics formed by unstitched piece of fabric. .
Ans. Saree, dhoti, lungi and turban.

Q.25. How are natural fibres better than synthetic fibres?
Ans. The natural fibre absorbs sweat, gives cooling effect and comfort in any season.

Q.26. Are all fibres produced by plants?
Ans. No.

Q.27. Cotton on burning gives paper burning smell and cotton is obtained from plants. Is paper also obtained from plants?
Ans. Yes, paper is also obtained from plants.

Class 6 Science Chapter 3 SHORT ANSWER TYPE QUESTIONS

Q.1. What do you observe when you are visiting a nearby tailoring shop?
Ans. In a tailoring shop we observe that there are many cuttings of fabrics left over after stitching. We see that some cuttings are of cotton, some are of silk or wool and some are of synthetic fibres.

Q.2. List the steps involved in the preparation of fabric.
Ans. The following steps are involved in the preparation of fabrics:
(i) Obtaining fibre,
(ii) Preparation of yarn from fibres by spinning,
(iii) When two sets of yarn are involved, yarns are woven on looms to make a fabric. When a single yam is used, the fabric is prepared by knitting.

Q.3. What are natural fibres? Explain with examples.
Ans. The fibres obtained from plants and animals are called natural fibres. For example, cotton from cotton bolls, jute from jute plant, silk from cocoon of silkworm and wool from hair of animals like sheep or goat.

Q.4. What are synthetic fibres?
Ans. The fibres which are made from chemical substances or which are not obtained from the plant and animal sources are called synthetic fibres. For example, polyester, nylon, and acrylic, etc.

Q.5. Explain how jute is obtained from the jute plant.
Ans. The jute plant is normally harvested at flowering stage. The stems of harvested plants are bundled and immersed in water for 10 to 15 days. The stems rot (the process is called retting) and fibres are separated by hand. These fibres are converted into yarns to make fabrics (Fig. 3.10).
NCERT Solutions for Class 6 Science Chapter 3 Fibre to Fabric SAQ Q5

Q. 6. What are looms?
Ans. The devices on which weaving of fabrics takes place are called looms. The looms are either hand operated or power operated.

Q. 7. What happens when a yam from a tom sock is pulled?
Ans. When we pull a yarn from a torn sock then a single yarn, gets pulled out continuously as the fabric gets unravelled. Socks are made up of knitted fabrics from a single yam.

Q. 8. What were the materials used by people in ancient times in place of clothes?
Ans. It appears that in those days people used the bark and big leaves of trees or animal skin and furs in place of clothes.

Q. 9. What happened when people began to settle in agricultural communities?
Ans. When people began to settle in agricultural communities then they learnt to weave twigs and grass into mats and baskets. Vines, animal fleece or hair were twisted together into long strands. These strands were woven into fabrics.

Q. 10. When we bum wool why do we get the smell of hair bum?
Ans. Wool is obtained from the fleece (hair) of sheep, goat, yak etc. This is the reason why burning of wool resembles the burning of hair.

Q. 11. When we bum nylon, why we do not get the smell of burning paper or burning hair?
Ans. Nylon is a synthetic fibre made from chemicals. On burning nylon these chemicals don’t produce the smell of burning paper or hair which are natural substances.

Class 6 Science Chapter 3 LONG ANSWER TYPE QUESTIONS

Q.1. Describe the process of the formation of yam from cotton wool.
Ans. The cotton wool is obtained from cotton plants. The cotton plants are grown in fields. They are usually grown at the places having black soil and warm climate. The fmits of the cotton plants called cotton bolls are about the size of lemons. After maturing, the bolls burst open and seeds covered with cotton fibres can b,e seen. From the cotton bolls cotton is picked by hands. Fibres are then separated from the seeds by combing. This process is called ginning of cotton. It is done by hand or by machines. These fibres are then converted into yam.
NCERT Solutions for Class 6 Science Chapter 3 Fibre to Fabric LAQ Q1
Q.2. Describe the process of spinning and weaving.
Ans. Spinning: The process of making yarn from fibres is called spinning. In this process fibres from a mass of cotton wool are drawn out and twisted. By this fibres come together to form a yarn. Spinning can be done by hand, by takli and charkha. On a large scale, spinning is done with the help of machines.
Weaving: The process of arranging two sets of yarns together t6 make a fabric is called weaving. The process of weaving can be done on looms. The looms are either-hand operated or power operated.

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NCERT Solutions for Class 6 Science Chapter 6 Changes Around Us

NCERT Solutions for Class 6 Science Chapter 6 Changes Around Us

NCERT Solutions for Class 6 Science Chapter 6 Changes Around Us

Topics and Sub Topics in Class 6 Science Chapter 6 Changes Around Us

Section Name Topic Name
6 Changes Around us
6.1 Can all changes always be reversed?
6.2 Could there be other ways to bring a change?

Class 6 Science Chapter 6 Textbook Questions Solved

1. To walk through a waterlogged area, you usually shorten the length of your dress by folding it. Can this change be reversed?
Ans: Yes, it can be reversed by unfolding the dress.

2. You accidentally dropped your favourite toy and broke it. This is a change you did not want. Can this change be reversed?
Ans: No, this change (breaking of toy) cannot be reversed.

3. Some changes are listed in the following table. For each change, write in the blank column, whether the change can be reversed or not.
NCERT Solutions for Class 6 Science Chapter 6 Changes Around Us Q3

4. A drawing sheet changes when you draw a picture on it. Can you reverse this change?
Ans: No, we cannot get fresh drawing sheet once a picture is drawn on it with paint/ oil or water. However, we can reverse the change, if soft pencil is used to draw the picture.

5. Give examples to explain the difference between changes that can or cannot be reversed.
Ans: Examples of reversible and irreversible changes
NCERT Solutions for Class 6 Science Chapter 6 Changes Around Us Q5

NCERT Solutions for Class 6 Science Chapter 6 Changes Around Us Q5.1

6. A thick coating of a paste of Plaster of Paris (POP) is applied over the bandage on a fractured bone. It becomes hard on drying to keep the fractured bone immobilised. Can the change in POP be reversed?
Ans: No, the change in POP cannot be reversed since it is a chemical change.

7. A bag of cement lying in the open gets wet due to rain during the night. The next day the sun shines brightly. Do you think the changes, which have occurred in the cement, could be reversed?
Ans. No, these are irreversible chemical changes.

EXTRA QUESTIONS for Class 6 Science Chapter 6

Class 6 Science Chapter 6 VERY SHORT ANSWER TYPE QUESTIONS

1. Give two examples of slow changes.
Ans:
(a) Growing of plants
(b) Ripening of fruits.

2. Give two examples of fast changes.
Ans:
(a) Blowing of balloon
(b) Rolling out roti from dough ball.

3. Give two examples of reversible changes.
Ans:
(a) Drying of wet clothes
(b) Heating of milk.

4: Give two examples of irreversible changes.
Ans:
(a) Milk to cheese
(b) Cooking of food.

5. Can you say deforestation is an irreversible or reversible change?
Ans: It is an irreversible change.

6. Does the size of the paper change after making an aeroplane by folding it or by cutting it?
Ans: Yes.

7. Can you change the shape of a eraser after erasing?
Ans: Yes.

8. Why does a blacksmith heat the metal rim to fix it on a cart wheel?
Ans: A blacksmith heats the metal rim to fix it onto a cart wheel because a metal rim is made slightly smaller. On heating, the rim expands and fits onto the wheel. Then on cooling, the rim contracts and fits tightly onto the wheel.

9. What are slow and fast changes? Give examples.
Ans: The changes which take place in a long period of time are called slow changes whereas that changes which take place in a short period of time are called fast changes.
Examples:
(a) Rusting of iron, formation of day and night, ripening of fruits, growing of trees are slow changes.
(b) Burning of paper, stretching of rubber band, blowing of balloons, bursting of crackers are fast changes.

10. Classify the following into slow and fast changes:
(i) Spinning of top
(ii) Formation of day and night
(iii) Formation of curd from milk
(iv) Change of season
(v) Making curd from milk by adding lemon juice.
Ans:
(i) Fast change
(ii) Slow change
(iii) Slow change
(iv) Slow change
(v) Fast change.

11. Classify the following as slow or fast change:
(i) Bearing of heart
(ii) Change of seasons
(iii) Burning of paper
(iv) Weathering of rocks
(v) Melting of wax
(vi) Cooking of food
(vii) Burning of wax
(viii) Melting of ice cream
(ix) Curding of milk
(x) Formation of day and night
Ans:
(i) Fast
(ii) Slow
(iii) Fast
(iv) Slow
(v) Fast
(vi) Slow
(vii) Fast
(viii) Fast
(ix) Slow
(x) Slow

12. Write some changes happening in our body.
Ans:
(a) Our nails grow
(b) Our hair grows
(c) We grow taller
(d) Our weight increases.

 13. Some common changes are given in Table 6.1. Which of these changes do you think can be reversed?
NCERT Solutions for Class 6 Science Chapter 6 Changes Around Us VSAQ Q13

Class 6 Science Chapter 6 SHORT ANSWER TYPE QUESTIONS

1. What is a physical change? Explain with example.
Ans: The changes in which only physical properties of substances are changed and no new substance is formed is called physical change. It is a reversible change. Example: Boiling and freezing of water.
NCERT Solutions for Class 6 Science Chapter 6 Changes Around Us SAQ Q1

2. What is a chemical change? Explain with example.
Ans: The changes in which new substance with new chemical properties are formed are called chemical changes.
Example: Reaction between washing soda and lemon juice in which C02 and other substances are formed.
NCERT Solutions for Class 6 Science Chapter 6 Changes Around Us SAQ Q2

3. What happens when sugar is heated?
Ans: When sugar is heated continuously then a black powdery substance is formed. This is a chemical change.
NCERT Solutions for Class 6 Science Chapter 6 Changes Around Us SAQ Q3

Class 6 Science Chapter 6 LONG ANSWER TYPE QUESTIONS

1. Explain how a metal rim slightly smaller than a wooden wheel can be fixed on it.
Ans: The metal rim is always made slightly smaller than the wooden wheel. The metal rim is heated. On heating, the rim expands and fit onto the wheel. Cold water is then poured over the rim. Due to cooling the metal rim contracts and fits tightly onto the wheel.
NCERT Solutions for Class 6 Science Chapter 6 Changes Around Us LAQ Q1
2. How does curd being set? Is this change reversible?
Ans: A small quantity of curd is added to warm milk. The milk is stirred and is set aside undisturbed for a few hours at a warm place. In a few hours, the milk changes into curd.
Curd formed from milk cannot be changed into milk again. So, this an irreversible (cannot be reversed) change.

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NCERT Solutions for Class 6 Science Chapter 7 Getting to Know Plants

NCERT Solutions for Class 6 Science Chapter 7 Getting to Know Plants

NCERT Solutions for Class 6 Science Chapter 7 Getting to Know Plants

Topics and Sub Topics in Class 6 Science Chapter 7 Getting to Know Plants:

Section Name Topic Name
7 Getting to Know Plants
7.1 Herbs, Shrubs and Trees
7.2 Stem
7.3 Leaf
7.4 Root
7.5 Flower

Class 6 Science Chapter 7 Textbook Questions Solved

1. Correct the following statements and rewrite them in your notebook.
(a) Stem absorbs water and minerals from the soil.
(b) Leaves hold the plant upright.
(c) Roots conduct water to the leaves.
(d) The number of sepals and petals in a flower is always equal.
(e) If the sepals of a flower are joined together, its petals are also joined together,
(f) If the petals of a flower are joined together, then the pistil is joined to the petal.
Ans:
(a) Roots absorb water and minerals from the soil.
(b) Roots hold the plant upright.
(c) Stem conducts water to the leaves.
(d) The number of petals and sepals in a flower is usually equal.
(e) If the sepals of a flower are joined together, its petals are not necessarily joined together.
(f) If the petals of a flower are joined together, then the pistil is not necessarily joined to the petal.

 2. Draw (a) a leaf, (b) a tap root and (c) a flower, you have studied for Table 7.3 of the textbook.
Ans:
NCERT Solutions for Class 6 Science Chapter 7 Getting to Know Plants Q2

NCERT Solutions for Class 6 Science Chapter 7 Getting to Know Plants Q2.1

NCERT Solutions for Class 6 Science Chapter 7 Getting to Know Plants Q2.2

3. Can you find a plant in your house or in your neighbourhood which has a long but a weak stem? Write its name. In which category would you classify it?
Ans: Yes, we find a money plant in our house. It is a climber.

4. What is the function of a stem in a plant?
Ans: A stem performs following functions:
(i) The stem and its branches hold leaves to get maximum sunlight.
(ii) It transports water from roots to different parts of the plant.
(iii) It transports food from leaves to different parts of the plant.
(iv) It bears leaves, flowers and fruits.

5. Which of the following leaves have reticulate venation?
Wheat, tulsi, maize, grass, coriander (dhania), china rose.
Ans: Tulsi, china rose.

6. If a plant has fibrous root, what type of venation are its leaves likely to have?
Ans: Parallel venation.

7. If a plant has leaves with reticulate venation, what kind of roots will it have?
Ans:Tap root.

8. Is it possible for you to recognise the leaves without seeing them? How?
Ans: We cannot exactly recognise the leaves without seeing them. We may be able to have some idea by touching and smelling them.

9. Write the names of the parts of a flower in sequence, from outside to inside.
Ans: The names of various parts of a flower from outside to inside are:
(i) Sepals
(ii) Petals
(iii) Stamens
(iv) Pistil

10. Which of the following plants have you seen? Of those that you have seen, which one have flowers?
Grass, maize, wheat, chilli, tomato, tulsi, pipal, shisham, banyan, mango, jamun, guava, pomegranate, papaya, banana, lemon, sugarcane, potato, groundnut
Ans:
NCERT Solutions for Class 6 Science Chapter 7 Getting to Know Plants Q10

11. Name the part of the plant which produces its food. Name this process.
Ans: Leaves produce food for the plant. This process is called photosynthesis.

12. In which part of a flower you are likely to find the ovary?
Ans: We find ovary in pistil. It is the lowermost part of the pistil.

13. Name two flowers, each with joined and separates sepals. 
Ans:
Flowers with joined sepals:
(i) Datura
(ii) Loki
Flowers with separate sepals:
(i) Gurhal
(ii) Mustard

EXTRA QUESTIONS for Class 6 Science Chapter 7 

Class 6 Science Chapter 7 VERY SHORT ANSWER TYPE QUESTIONS

1. List few plants found around your house.
Ans:  Mango, neem, grass, chilli, palak and banyan tree.

2. Are all the plants same in size?
Ans: No, all plants are of different sizes.

3. What are the major parts of plants?
Ans: Stem, root, leaves and flowers.

4. How many kinds of plants are there?
Ans: There are three kinds of plants:
(i) Herbs
(ii) Shrubs
(iii) Trees

5. Name two plants that belong to herbs.
Ans:
(i) Tomato
(ii) Potato

6. Give two examples of shrubs.
Ans:
(i) Lemon
(ii) Orange

7. Give two examples of trees.
Ans:
(i) Mango
(ii) Neem

8. Define petiole.
Ans: The part (stalk) of a leaf by which it is attached to the stem is called petiole.

9. What is lamina?
Ans:  The broad green flat part of leaf is called lamina.

10. What are veins?
Ans:  The lines on the leaf are called veins.

11. What is midrib?
Ans: A thick vein in the middle of the leaf is called midrib.

12. What is leaf venation?
Ans: The design made by veins in a leaf is called leaf venation.

13. How many types of leaf venation are there?
NCERT Solutions for Class 6 Science Chapter 7 Getting to Know Plants VSAQ Q13
Ans: There are two types of leaf venation:
(i)  Reticulate venation
(ii)   Parallel venation

14. What is transpiration?
Ans: The process by which water comes out from the leaves in the form of vapour is called transpiration.

15. Name the process by which leaves can prepare their food.
Ans: This process is called photosynthesis.

16. What are the raw materials for photosynthesis?
Ans:
(i)    Sunlight
(ii)  Water
(iii) Carbon dioxide
(iv)   Chlorophyll

17. Where does the photosynthesis take place in plants?
Ans: It takes place in the leaves.

18.  Name the part of plant which helps in holding the plant in the soil.
Ans: Roots.

19. Name the types of roots shown in the Fig. 7.7.
NCERT Solutions for Class 6 Science Chapter 7 Getting to Know Plants VSAQ Q19
Ans: (i) Tap roots (ii) Fibrous roots

20. What are tap roots?
Ans: The roots in which one root is main root and other lateral roots grow on it are called tap roots.

21. Give names of two plants which have tap root.
Ans: Gram and mustard.

Q. 22. Name two plants which have fibrous root.
Ans: (i) Wheat plant         (ii) Maize plant

23. What are lateral roots?
Ans: The smaller roots that grow on the main tap root are called lateral roots.

24. What are fibrous roots?
Ans: The roots which do not have any main root but all the roots are similar are called fibrous root.

25. Does the stem prepare food for any plant?
Ans: Yes, there are some plants whose stem prepares food, e.g. cactus.

26. Name the prominent parts of a flower.
Ans: The prominent parts of a flower are petals, sepals, stamens and pistil.

27. What are sepals? What are their functions?
Ans: The small green coloured leaf-life structures are called sepals. It protects flower when it is in stage of bud.

28. What are petals? Why are they generally coloured?
Ans: The coloured big leaf-life structures present in flower are called petals. Petals are coloured so as to attract insects for pollination.

29. What are stamens?
Ans:When we remove sepals and petals from the flower then we see some filaments in the flower which are called stamens. These, are the male part of the flower.
NCERT Solutions for Class 6 Science Chapter 7 Getting to Know Plants VSAQ Q29

30. Name various parts of stamen.
Ans: There are two parts of a stamen:
(i) Anther (ii) Filament.
These are the male part of the flowers.

31. What is pistil?
Ans: The innermost part of a flower is called pistil. These are the female part of the flowers.
NCERT Solutions for Class 6 Science Chapter 7 Getting to Know Plants VSAQ Q31

32. Name the various parts of pistil.
Ans: There are three parts of pistil:
(i) Stigma              (ii) Style             (iii) Ovary

33. What are ovules?
Ans: These are small bead-like structures inside the ovaiy.

Class 6 Science Chapter 7 SHORT ANSWER TYPE QUESTIONS
1. What are weeds?
Ans: The unwanted plants that grow in the fields with the main crops or in their surroundings are called weeds. Weeds are the plants which are not grown by the farmers. For example, grass.

2. Classify plants and give an example of each.
Ans: On the basis of various characteristics most of the plants can be classified into three categories:
(i) Herbs, e.g. tomato
(ii) Shrubs, e.g. lemon
(iii) Trees, e.g. mango

3. What are herbs? Give two examples.
Ans: The plants with green and tender stems are called herbs. They are usually short and may have no or less branches. For example, tomato, potato.

4. What are shrubs? Give two examples.
Ans: The plants which have a hard but not a very thick stem are called shrubs. Such plants have the stem branching out near the base. For example, lemon, rose plants.

5. What are trees? Give two examples.
Ans: The plants which are very tall and have hard and thick brown stem are called trees. The stems have branches in upper part and much above the ground. For example, mango, neem.

6. What are creepers? Write an example.
Ans. The plants with weak stem that cannot stand upright and spread on the ground are called creepers. Various types of grasses are the examples of creepers.

7. What are climbers?
Ans: The plants that take support of neighbouring structures and climb up are called climbers. They have weak stem. For example, grapes, money plant, beans.

8. Explain an activity to show that stem conducts water and other substances.
Ans: Take some water in a glass. Add few drops of red ink to the water. Cut the stem of a herb plant from its base. Put it in the glass as shown in figure. We will see that some parts of the stem become red. This activity shows that stem conducts water.
NCERT Solutions for Class 6 Science Chapter 7 Getting to Know Plants SAQ Q8

9. Explain the structure of a leaf with the help of a labelled diagram.
Ans: There are two main parts of leaf:
(i) Petiole: The part of the leaf by which it is attached to the stem is called petiole.
(ii) Lamina: The broad, green part of the leaf is called lamina.
NCERT Solutions for Class 6 Science Chapter 7 Getting to Know Plants SAQ Q9
The lamina contains following parts:
(i) Veins: There are various types of lines on the leaf. These lines are called veins
(ii) Midrib: There is a thick vein in the middle of the leaf. This vein is called midrib.

10. Explain the main functions of leaf.
Ans: There are following two main functions of leaf:
(i) Transpiration: The extra water comes out of the leaves in the form of vapour. This process is called transpiration.
(ii) Photosynthesis: The process by which leaves prepare their food from water and carbon dioxide, in the presence of sunlight and a green-coloured substance, is called photosynthesis.

11. What are unisexual and bisexual flowers?
Ans: Unisexual flower has either male (stamen) or female (pistil) parts.
Bisexual flowers have both male and female whorl in the flowers, i.e., they have both stamen and pistil.

12. Name a plant that eats insect.
Ans: Pitcher plant.

13. Pitcher plant has green leaves which can prepare food by photosynthesis then why does it eat insects?
Ans: To get nitrogenous compounds which it cannot absorb from the soil.

14. Name a plant that has underground as well as aerial (above the ground) root system.
Ans: Banyan tree.

15. Why do we see dew drops on leaves in the early morning?
Ans: At night the water lost by leaves does not get evaporated and gets collected on the leaves in the form of dew drops.

16. Why are petals colourful?
Ans: The colourful petals attract insects for pollination.

17. Why does white flowers bloom at night?
Ans: White colour attracts night insects for pollination.

18. What do you mean by a complete and incomplete flower?
Ans: The flower with all whorls, i.e., sepals, petals, stamen and carpel in it is a complete flower. If any one of this is absent in a flower it is called an incomplete flower.

19. Leaves need oxygen and carbon-dioxide (for photosynthesis). How do they get these gases?
Ans: Leaves take in these gases from atmosphere through small pores present on them called stomata.

20. How can one destarch the leaves of potted plant without plucking, them?
Ans: By keeping it in dark for 2-3 days.

21. What is the relation between leaf venation and the type of roots?
Ans: The plants having tap root have reticulate venation. The plants having fibrous roots have parallel venation.

22. Name the male part of a flower. Write names of its parts and draw a diagram.
Ans: The male part of a flower is called stamen. It has two parts: (i) Filament and (ii) Anther.
NCERT Solutions for Class 6 Science Chapter 7 Getting to Know Plants SAQ Q22

23.Name the female part of a flower. Write names of its parts and draw a diagram.
Ans:The female part of a flower is called pistil. It has three parts: (i) Stigma, (ii) Style, and (iii) Ovary.
NCERT Solutions for Class 6 Science Chapter 7 Getting to Know Plants SAQ Q23

24. Differentiate between tap root and fibrous root.
Ans:
NCERT Solutions for Class 6 Science Chapter 7 Getting to Know Plants SAQ Q24

Class 6 Science Chapter 7 LONG ANSWER TYPE QUESTIONS

1. What do you mean by leaf venation? Explain various types of leaf venation with example.
Ans: Leaf venation: The design made by veins in a leaf is called leaf venation. There are the following two types of leaf venation:
(i) Reticulate venation: If the design of veins makes a net-like structure on both the sides of midrib then it is called reticulate venation. For example, mango leaf, gram leaf.
(ii) Parallel venation: If the veins are parallel to each other or to midrib then such type of venation is called parallel venation. For example, wheat leaf, barley leaf.
NCERT Solutions for Class 6 Science Chapter 7 Getting to Know Plants LAQ Q1

2. Explain the structure of a typical flower with the help of a diagram.
Ans: A typical flower contains the following parts:
(i) Stalk: The part by which a flower is attached to the branch is called stalk.
(ii) Sepals: The small green leaf-like structures of the flower are called sepals,
(iii) Petals: The big coloured leaf-like structures are called petals. Different flowers have petals of different colours.
(iv) Stamen: It is the male part of the flower. It has two parts: (a) Filament and (b) Anther.
(v) Pistil: The innermost part of a flower is called pistil. It has three parts: (a) Stigma, (b) Style and (c) Ovary. It is the female part of the flower.
NCERT Solutions for Class 6 Science Chapter 7 Getting to Know Plants LAQ Q2

3. Explain an activity to test the presence of starch in a leaf.
Ans: Take a leaf in a test tube and pour spirit till it completely covers the leaf. Now put the test tube in a beaker having water. Heat the beaker till all the green colour from the leaf comes out into the spirit in the test tube. Take out the leaf and wash it with water. Put it on a plate and pour some iodine solution over it. The iodine solution is brown in colour but when it comes in contact with starch it turns blue-black. The iodine solution will turn blue-black when dropped on the leaf, this confirms the presence of starch in the leaf.
NCERT Solutions for Class 6 Science Chapter 7 Getting to Know Plants LAQ Q3

4. Explain that sunlight is essential for photosynthesis.
Ans: Take a potted plant having green leaves. Place it in a dark room for a day or two so that all the starch present in leaves is used by the plant. Now cover a portion of leaf with black paper and keep the plant in the sun for a day. Pluck the leaf, remove the black paper and test it for the starch. We see that only that part of the leaf becomes blue-black which was open to sun. The covered part does not become blue-black. This shows that no starch is formed because it gets no sunlight.

5. Explain the important functions of root.
Ans:. The following are the functions of root:
(i) They help to absorb water from the soil.
(ii) The roots help in holding the plants firmly in the soil.
(iii) They are said to anchor the plant to the soil.

6. Explain various kinds of roots with the help of an example.
Ans: There are following two types of roots:
(i) Tap roots: The roots which have one main root and other smaller lateral roots are called tap roots. For example, mustard plant, gram.
(ii) Fibrous roots: The roots which have no main root but all the roots appear similar are called fibrous roots. For example, maize, wheat.
NCERT Solutions for Class 6 Science Chapter 7 Getting to Know Plants LAQ Q6

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NCERT Solutions for Class 6 Science – All Chapters