Solving ICSE Class 10 Biology Previous Year Question Papers ICSE Class 10 Biology Question Paper 2012 is the best way to boost your preparation for the board exams.
ICSE Class 10 Biology Question Paper 2012 Solved
Time: 1 1/2 hour
Maximum Marks: 40
General Instructions :
- Answers to this Paper must be written on the paper provided separately.
- You will not be allowed to write during the first 15 minutes.
- This time is to be spent in reading the Question Paper,
- The time given at the head of this Paper is the time allowed for writing the answers.
- Attempt all questions from Section I and any four questions from Section II.
- The intended marks for questions or parts of questions are given in brackets [ ].
Section-I (40 Marks)
(Attempt all questions from this section)
Question 1.
(a) Name the following :
(i) The phenomenon by which living or dead plant cells absorb water by surface attraction.
(ii) The phase of cardiac cycle in which the auricles contract.
(iii) The organ where urea is produced.
(iv) The hormone that helps increase the reabsorption of water from the kidney tubules.
(v) Chemical substances produced by micro organisms that can kill or inhibit the growth of other micro organisms. [5]
Answer:
(i) Imbibition
(ii) Systole
(iii) Liver
(iv) Vasopressin (ADH)
(v) Antibiotics
(b) Choose the correct answer from the four options given below each statement :
(i) BCG vaccine is used to build immunity against:
(a) Poliomyelitis
(b) Tuberculosis
(c) Malaria
(d) Whooping cough
Answer:
(b) tuberculosis
(ii) A plant is kept in a dark cupboard for about 48 hours before conducting any experiment on photosynthesis to :
(a) Remove starch from the plant.
(b) Ensure that starch is not translocated from the leaves.
(c) Remove chlorophyll from the leaf of the plant.
(d) Remove starch from the experimental leaf.
Answer:
(a) Remove starch from the plant
(iii) The part of the human eye where rod cells and cone cells are located is the :
(a) Retina
(b) Cornea
(c) Choroid
(d) Sclera
Answer:
(a) Retina
(iv) A reflex arc in man is best described as movement of stimuli from :
(a) Receptor cell, sensory neuron, relaying neuron, effector muscles.
(b) Receptor cell, efferent nerve, relaying neuron, muscles of the body.
(c) Receptor cell, spinal cord, motor neuron, relaying neuron.
(d) Receptor cell, synapse, motor neuron, relaying neuron.
Answer:
(a) Receptor cell, sensory neuron, relaying neuron, effector muscles.
(v) NADP is expanded as :
(a) Nicotinamide, adenosine dinucleotide phosphate.
(b) Nicotinamide, adenine dinucleotide phosphate
(c) Nicotinamide, adenine dinucleous phosphate
(d) Nicotinamide, adenosine dinucleous phosphate. [5]
Answer:
(b) Nicotinamide, adenine, dinucleotide phosphate
(c) State the main function of the following :
(i) Chordae tendinae
(ii) Lymphocytes
(iii) Seminiferous tubule
(iv) Thylakoids
(v) Beta cells of pancreas
Answer:
(i) Chordae tendinae connect the papillary muscles to the tricuspid valve and the mitral valve in the heart.
(ii) Lymphocytes produce antibodies and provide immunity to the body.
(iii) Seminiferous tubule produce sperms (male gametes).
(iv) Thylakoids are the site for light reaction during photosynthesis.
(v) Beta cells of pancreas secrete the hormone insulin.
(d) Give the exact location of:
(i) Lenticels
(ii) Prostate gland
(iii) Thyroid gland
(iv) Centrosome
(v) Mitral valve
Answer:
(i) Lenticels – in the stem of woody plants.
(ii) Prostate gland – a bilobed structure surrounding the urethra close to its origin from the bladder.
(iii) Thyroid gland- a butterfly shaped gland is situated in front of the neck below the larynx.
(iv) Centrosome – situated next to the nucleus.
(v) Mitral valve – situated between left atrium and the left ventricle of the heart.
(e) given below are sets of five terms each. In each case rewrite the terms in logical sequence as directed at the end of each statement. An example has been done for you:
Example :
Cortical cells, root hair, xylem, soil water, endodermis (absorption of water by the plants)
Answer: Soil water, root hair, cortical cells, endodermis, xylem.
(i) Active immunity, antigen, antibody, bacteria, lymphocytes (defence mechanisms of the body).
(ii) Implantation, parturition, ovulation, gestation, fertilisation (stages leading to formation of foetus and birth).
(iii) Oval window, tympanum, cochlea, auditory canal, ear ossicles (path through which a vibration of sound is transferred in the human ear).
(iv) Karyokinesis, S-phase, cytokinesis, G1-phase, G2-phase (cell cycle).
(v) Renal vein, renal artery, afferent arteriole, efferent arteriole, glomerulus (pathway of blood through a glomerulus). [5]
Answer:
(i) Bacteria, lymphocytes, antibody, antigen, active immunity.
(ii) Ovulation, fertilisation, implantation, gestation, parturition.
(iii) Tympanum, ear ossicles, ova\ window, cochlea, auditory canal.
(iv) Karyokinesis, G1 -phase, S-phase, G2-phase, Cytokinesis.
(v) Renal artery, afferent arteriole, glomerulus, efferent arteriole, renal vein.
(f) Study the following diagram carefully and then answer the questions that follow. The diagram is depicting a defect of the human eye :
(i) Identify the defect shown in the diagram.
(ii) Give two possible reasons for the above defect.
(iii) Draw a neat labelled diagram to show how the above defect can be rectified.
Answer:
(i) Long sightedness
(ii)
- To flattering of the lens.
- Shortening of the eyeball.
(iii)
(g) Match the items in Column A with that which is most appropriate in Column B. Rewrite the matching pairs.
Answer:
(1) – (g)
(2) – (e)
(3) – (b)
(4) – (e)
(5) – (d)
(h) Given below are six sets with four terms each. In each set a term is an odd one and cannot be grouped in the same category to which the other three belong. Identify the odd one in each set and name the category to which the remaining three belong. The first has been done for your as an example.
| No. | Set | Odd one | Category |
| e.g.: | Cell wall, large vacuole, plastids, centrosome | centrosome | Parts of plant cell |
| (i) | Cerebrum, cerebellum, thalamus hypothalamus | ||
| (ii) | Ovary, ureter, fallopian tube, | ||
| (iii) | Adrenal gland, liver, thyroid gland, pituitary gland | ||
| (iv) | Malleus, pinna, incus, stapes | ||
| (v) | Haemophilia, colour blindness, albinism, night blindness |
Answer:
| No. Set | Odd one | Category |
| e.g.: Cell wall, large vacuole, plastids, centrosome | centrosome | Parts of plant cell |
| (i) Cerebrum, cerebellum, thalamus hypothalamus | Cerebellum | Part of fore-brain |
| (ii) Ovary, ureter, fallopian tube, | centrosome | Part of female reproductive system |
| (iii) Adrenal gland, liver, thyroid gland, pituitary gland | Odd one | Endocrine glands |
| (iv) Malleus, pinna, incus, stapes | Cerebellum | Middle ear |
| (y) Haemophilia., colour blindness, albinism, night blindness | Ureter | Hereditary, diseases |
Section-II (40 Marks)
(Attempt any four questions from this section)
Question 2.
(a) Given below is an experimental set up to demonstrate a particular process. Study the same and answer the questions that follow.
(i) Name the physiological process being studied.
(ii) Explain the process mentioned above.
(iii) What is the aim of the above experiment ?
(iv) What would you observe in the experimental set-up after an hour ? Give a reason to support your answer.
(v) Mention any three adaptations found in plants to overcome the physiological process mentioned in (i) above. [5]
Answer:
(a) (i) Transpiration in plants.
(ii) Transpiration is the loss of water vapour from the surface of the plant, mainly from the leaves.
(iii) To compare the transpiration on the two sides or surfaces of a dorsiventral leaf.
(iv) After an hour, the paper on the lower surface of the leaf turns pink whereas the paper on the upper surface takes more time to do so. This proves that more transpiration takes place on the lower surface due to the presence of numerous stomata on it.
(v)
- Leaves with thick cuticle
- Sunken stomata
- Leaves modified to spines
(b) Give biological/technical terms for the following :
(i) A membrane which allows the passage of molecules selectively.
(ii) The suppressed allele of a gene.
(iii) Structure that carries visual stimuli from retina to the brain.
(iv) WBCs squeeze through the walls of the capillaries into the tissue.
(v) Protective coverings located round the human brain and spinal cord.
(vi) Eye lens losing flexibility resulting in a kind of long sightedness in elderly people.
(vii) Hormones which stimulate other endocrine glands to produce their specific hormones.
(viii) The phase in the menstrual cycle in which the remnant of follicle in the ovary turns to Corpus luteum.
(ix) Statistical study of human population.
(x) Artificially introducing weekend germs or germ substance into the body for developing resistance to a particular disease. [5]
Answer:
(i) Semi permeable membrane.
(ii) Recessive
(iii) Optic nerve
(iv) Diapedesis
(v) Meninges
(vi) Astigmatism
(vii) Hormones of pituitary gland
(viii) Secretory phase
(ix) Demography
(x) Vaccination
Question 3.
(a) Given below in the diagram of a cell as seen under the microscope after having been placed in a solution:
(i) What is the technical term used for the state/condition of the cell given above?
(ii) Give the technical term for the solution in which the cell was placed.
(iii) Name the parts numbered 1 to 4.
(iv) Is the cell given above a plant cell or an animal cell ? Give two reasons in support of your answer as evident from the diagram.
(v) What would you do to bring this cell back to its original condition? [5]
Answer:
(i) Plasmolysed cell
(ii) Hypertonic solution
(iii)
- Nucleus
- Chloroplast
- Vacuole
- Cell sap
(iv) It is a plant cell, because
- There are chloroplasts in the cell.
- The shape of a cell is hexagonal i.e., a plant cell.
(v) We can place it in a hypotonic solution.
(b) Differentiate between the following pairs on the basis of what is mentioned in brackets:
(i) Natality and mortality (definition)
(ii) Stoma and Storma (describe its structure)
(iii) Acromegaly and Cretinism (symptoms)
(iv) Transpiration and Guttation (structure involved)
(v) Diabetes mellitus and Diabetes insipidus (reasonlcause) [5]
Answer.
(i) Natality is the number of births per 1000 individuals in the population per year.
Mortality is the number of deaths per 1000 individuals in the population per year.
(ii) Stoma is a pore present in the epidermis of leaves.
Stroma is a fluid in chloroplast containing enzymes that use ATP.
(iii) Acromegaly is a chronic condition developing in adulthood due to over production of growth hormone.
Cretinism is a condition that results from inadequate secretion of thyroid hormones during fetal life.
(iv) Transpiration takes place through stomata while guttation takes place though hydathodes.
(v) Diabetes mellitus s caused due to insufficient secretion of insulin. Diabetes insipidus is caused due to the excess secretion of insulin.
Question 4.
(a) The diagram below shows the Exretory System of a Human being. Study the same and then añswer the questions that follow:
(i) Name the parts labelled 1, 2, 3 and 4.
(ii) Give the main function of the parts labelled 5, 6, 7 and 8.
(iii) Name the endocrine gland which could be added in the diagram and state its location/position. 15]
Answer:
(i)
1. Posterior Vena cava
2. Aorta
3. Left renal artery
4. Left renal vein
(ii) 5. Ureters convey the urine from the kidneys to the bladder.
6. Urinary bladder is large sac in which urine is stored or collected.
7. Sphincter controls the release of urine from the bladder.
8. Urethra let the urine drain from the bladder.
(iii) Adrenal gland, it is located at the top of each kidney.
(b) Briefly explain the following:
(i) Osmosis
(ii) Allele
(iii) Pulse
(iv) Reflex action
(v) Synapse [5]
Answer.
(i) Osmosis is the net movement of water molecules from a region of their higher concentration to a region of their higher concentration through a semipermeable membrane.
(ii) A pair of genes that controls the two alternative expressions of the same character and has the same loci in the homologous chromosomes is called the allele.
(iii) The rhythmic contraction of the heart felt in certain areas like the wrist in the form of pulsations, and this is called pulse.
(iv) Reflex actions are involuntary actions controlled by the spinal cord. It is a rapid automatic response to a stimulus.
(v) Synapse is a junctional region between two neurons where information from one neuron is transmitted or relayed (handed over) to another neuron, but there is no protoplasmic connection between the two neurons.
Question 5.
(a) Study the diagram given below and then answer the question that follow:
(i) Name the part labelled A. Name any two hormones produced by the part labelled A.
(ii) What happens to the part labelled B
(1) If fertilisation takes place?
(2) If fertilisation does not take place?
(iii) Where does fertilisation occur?
(iv) Draw a neat diagram of the human sperm as seen under high magnification and label the following parts.
(1) Acrosome
(2) Mitoehondria
Answer:
(i) Ovary
Ovary pruces the hormones Estrogen and Progestrone.
(ii) (1) Endomentrium secretes nutrients in preparation for implantation.
(2) If fertilisation does not take place, it degenerates or shed from the body.
(iii) Fertilisation takes place in the ampulla of the fallopian tube.
(iv)
(b) A homozygous plant having round (R) and yellow (Y) seed is crossed with homozygous plant having wrinkled (r) and green (y) seeds:
(i) Give the scientific name of the plant on which Mendel conducted his hybridization experiments.
(ii) Give the genotype of the F1 generation.
(iii) Give the dihybrici phenotypic ratio and the phenotype of the offspring of F2 generation
when two plants of the F1 generation are crossed.
(iv) Name and state the law which explains the dihybrid ratio.
(v) Give the possible combinations of gametes that can be obtained from F1 hybrid. [5]
Answer:
(i) Pisum sativum
(ii) Tt (Heterozygous)
(iii) Dihybrid phenotypic ratio = 9 : 3 : 3 : 1
Phenotype of F2 generation =
9 round and yellow
3 round and green
3 wrinkled and yellow
1 wrinkled and green
(iv) Law of independent assortment: When more than one pair of contrasting characters are brought together in an individual, the entry of one pair of allele (controlling one character) separates independently and assorts independently of any other pair of alleles (controlling another character).
(v) F1 Hybrid = Tt
possible combinations of gamets = T, t
Question 6.
(a) The diagram given below is an experiment conducted to study a factor necessary for Photosynthesis. Observe the diagrams and then answer the following questions :
(i) What is the aim of the experiment ?
(ii) Name the test performed on the leaf and the solution used for test.
(iii) What type of leaf was used for the experiment ? Give an example.
(iv) What is the expected result of the above test on the parts labelled A and B ?
(v) Give a balanced chemical to represent the process of Photosynthesis. [5]
Answer:
(i) To demonstrate that chlorophyll is essential for photosynthesis.
(ii) Starch test, iodine is used for this test.
(iii) Variegated leaf, for example coleus.
(iv) Part A will remain unchanged.
Part B will turn blue-black in colour.
(v)
(b) The diagrams given below show the cross section of two kinds of blood vessels :
(i) Identify the blood vessels A and B. In each case give a reason to support your answer.
(ii) Name the parts numbered 1 and 2.
(iii) When are the sounds “LUBB” and “DUP” produced during a heartbeat ?
(iv) Name the blood vessel that
(1) begins and ends in capillaries.
(2) supplies blood to the walls of the heart.
Answer.
(i) ‘A’ is a artery while ‘B’ is a vein.
The size of lumen in A is small, so it is an artery.
The size of lumen in B is larger, so it is a vein.
(ii) 1-Endothelium (Tunica Interna). 2-Lumen of the vessel
(iii) The sound ‘LUBB’ occurs due to the closure of the atrioventricular valves. While ‘DUP’ sound occurs as the aortic and pulmonary valves close to prevent the back flow of the blood.
(iv)
(1) Hepatic portal vein
(2) Coronary arteries
Question 7.
(a) Answer the following :
(i) Draw a well labelled diagram of a ‘Neuron’ and name the following parts :
(1) Node of Ranvier
(2) Nissil granules
(3) Cyton
(ii) Name the part of the human brain which is concerned with the following :
(1) Seat of memory
(2) Coordinates muscular activity
(iii) Mention any three major activities of the WHO.
Answer:
(i)
(ii)
(1) Cerebrum
(2) Cerebellum
(iii) WHO
- Promotes medical education and training.
- Promotes research and development of international standard for pharmaceutical products.
- To lay pharmaceutical standards for important drugs, ensure purity and size of the dose.
(b) (i) Draw a well labelled diagram to show the metaphase state of Mitosis in an animal cell having four chromosomes.
(ii) Mention any two reasons for the population explosion in INDIA.
(iii) Give biological reasons for the following :
(1) Pituitary gland is also known as the master gland.
(2) Gametes have a haploid number of chromosomes.
Answer:
(i) Metaphase plate
(ii)
- Desire to have a male child.
- Lack of education
(iii) (1) Pituitary gland influences almost all the endocrine glands of the body, so it is also called the master gland.
(2) Gametes contain half the normal number of chromosomes.