Solving ICSE Class 10 Biology Previous Year Question Papers ICSE Class 10 Biology Question Paper 2021 Semester 1 is the best way to boost your preparation for the board exams.
ICSE Class 10 Biology Question Paper 2021 Solved Semester 1
Time : 1\(\frac{1}{2}\) 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 10 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 A and any any three questions from Section B.
- The marks intended for questions are given in brackets [ ].
Section – A
(Attempt all questions from this Section)
Question 1.
Name the following by choosing the correct option: [10]
(i) The process of conversion of ADP to ATP during photosynthesis:
(a) Polymerisation
(b) Photophosphorylation
(c) Photorespiration
(d) Photolysis
Answer:
(b) Photophosphorylation
(ii) Permanently open structures seen on the barks of old woody stems:
(a) Stomata
(b) Hydathodes
(c) Lenticels
(d) Epidermal pores
Answer:
(c) Lenticels
(iii) The pressure developed in the roots due to continuous inward movement of water by cell to cell osmosis:
(a) Root Pressure
(b) Wall Pressure
(c) Turgor Pressure
(d) Air Pressure
Answer:
(a) Root pressure
(iv) The type of gene, which in presence of a contrasting allele is not expressed:
(a) Homozygous
(b) Heterozygous
(c) Dominant
(d) Recessive
Answer:
(d) Recessive
(v) After mitosis, a female human cell will have:
(a) 44 + XX chromosomes
(b) 22 + X chromosomes
(c) 22 + Y chromosomes
(d) 44 + XY chromosomes
Answer:
(d) 44 + XX chromosomes
Question 2.
Complete the following statements by chocsing the appropriate option for each blank:
(i) At the end of ____________ cytokinesis is completed.
(a) Metaphase
(b) Prophase
(c) Interphase
(d) Telophase
Answer:
(d) Telophase
(ii) The genotype of a person who cannot roll his tongue is _____________.
(a) Rr
(b) RR
(c) rr
(d) RRr
Answer:
(c) rr
(iii) When a cell is placed in a ____________ solution it becomes plasmolysed.
(a) Distilled water
(b) Hypertonic
(c) Isotonic
(d) Hypotonic
Answer:
(b) Hypertonic
(iv) The nitrogenous base Adenine always pairs with ____________
(a) Thymine
(b) Guanine
(c) Cytosine
(d) Thiamine
Answer:
(a) Thymine
(v) The basic units of heredity are ____________
(a) Chromosomes
(b) Chromatids
(c) Genes
(d) Centrosome
Answer:
(c) Genes
Question 3.
Choose the correct answer from each of the four options given below:
(i) NADP is expanded as:
(a) Nicotinamide Adenosine Dinucleotide Phosphate
(b) Nicotinamide Adenine Dinucleotide Phosphate
(c) Nicotinamide Adenine Dinucleolus Phosphate
(d) Nicotinamide Adenosine Dinucleolus Phosphate
Answer:
(b) Nicotinamide Adenine Dinucleotide Phosphate
(ii) Transpiration is useful to the plant because it:
(a) Creates a suction force for absorption of water from the soil
(b) Helps in photophosphorylation
(c) Synthesises glucose
(d) Splits water molecules
Answer:
(a) Creates a suction force for absorption of water from the soil
(iii) A homozygous pea plant having purple flowers is crossed with a homozygous pea plant bearing white flowers. The phenotypic ratio of the offspring obtained in F2 generation is:
(a) 2 : 1
(b) 1 : 1
(c) 1 : 2 : 1
(d) 3 : 1
Answer:
(d) 3 : 1
(iv) The shoot from a balsam plant is kept in a beaker containing eosin solution (pink). The pink colour will be distinctly seen in the:
(a) Xylem
(b) Phloem
(c) Epidermis
(d) Cortex
Answer:
(a) Xylem
(v) Replication of DNA in the cell cycle occurs during the:
(a) G1 – Phase
(b) Anaphase
(c) S – Phase
(d) G2 – Phase
Answer:
(c) S – Phase
Question 4.
Explain the following terms:
(i) Karyokinesis
(a) It is the division of nucleus during cell division
(b) It is the division of cytoplasm during cell division
(c) It is the division of centrosome
(d) It is the division of nucleolus
Answer:
(a) It is the division of nucleus during cell division.
(ii) Law of Dominance
(a) Out of a pair of contrasting alleles present together, only the recessive allele is able to express itself while the dominant remains suppressed
(b) Out of a pair of contrasting alleles present together, only the dominant allele is able to express itself while the recessive remains suppressed
(c) Out of a pair of contrasting alleles present together, both dominant and recessive cannot express themselves
(d) Out of a pair of contrasting alleles present together, both dominant and recessive can express themselves
Answer:
(b) Out of a pair of contrasting alleles present together, only the dominant allele is able to express itself while the recessive remains supressed.
(iii) Mutation:
(a) It is a sudden change in one or more genes in an organism’s cells which is heritable
(b) It is a change in the number of centrosomes in an organism’s cell which is heritable
(c) It is a change in the structure of cell membrane in an organism’s cells which is heritable
(d) It is a change in the shape of cells which is heritable
Answer:
(a) It is a sudden change in one or more genes in an organism’s cells which is heritable.
(iv) Photosynthesis
(a) It is the synthesis of glucose from carbon dioxide by non-green plants using light energy.
(b) It is the synthesis of glucose by green plants from carbon dioxide using light energy.
(c) It is the synthesis of glucose from carbon dioxide and water by non-green plants using light energy.
(d) It is the synthesis of glucose from carbon dioxide and water by green plants using light energy.
Answer:
(d) It is the synthesis of glucose from carbon dioxide and water by green plants using light energy.
(v) Transpiration:
(a) It is the loss of water in the form of droplets from the aerial parts of the plant.
(b) It is the loss of water in the form of water vapour from the underground parts of the plant.
(c) It is the loss of water in the form of water vapour from the aerial parts of the plant.
(d) It is the loss of water in the form of water vapour from all parts of the plant.
Answer:
(c) It is the loss of water in the form of water vapour from the aerial parts of the plant.
Question 5.
Mention the exact location of the following:
(i) Aster
(a) Around the centrioles in plant cells
(b) Around the centrioles in animal cells
(c) Around the chromatids in animal cells
(d) Around the chromatids in plant cells
Answer:
(b) Around the centrioles in animal cells
(ii) Guard cells
(a) Around the root hairs
(b) Around the lenticels
(c) Around the thylakoids
(d) Around the stoma
Answer:
(d) Around the stoma
(iii) Xylem tissue:
(a) Conducts water and minerals in leaves
(b) Does uot conduct water and minerals in stems
(c) Conducts food and nutrition to roots
(d) Conducts food and nutrients to all parts of the plant
Answer:
(a) Conducts water and minerals in leaves
(iv) Centrioles
(a) Found only in plant cells
(b) Found inside nucleus
(c) Found only in animal cells
(d) Found in animals and plant cells
Answer:
(c) Found only in animal cells
(v) Genes
(a) Present on cell walls
(b) Present on chloroplast
(c) Present on chromosomes
(d) Present on centrosomes
Answer:
(c) Present on chromosomes
Question 6.
State the function of the following:
(i) Cell wall
(a) Regulates entry of solutes in plant cells
(b) Regulates entry of solutes in animal cells
(c) Gives rigidity and shape to plant cells
(d) Gives rigidity and shape to animal cells
Answer:
(c) Gives rigidity and shape to plant cells.
(ii) Centromere:
(a) It is the point of attachment of two sister chromatids
(b) It is the point of attachment of two centrioles
(c) It is the point of attachment of two centrosomes
(d) It is the point of attachment between two daughter nuclei
Answer:
(a) It is the point of attachment of two sister chromatids.
(iii) Cuticle on leaves:
(a) Prevents photosynthesis
(b) Reduces transpiration
(c) Protects leaves from grazing animals
(d) Gives colour to leaves
Answer:
(b) Reduces transpiration.
(iv) Hydathodes
(a) Transpiration
(b) Absorption of water
(c) Photosynthesis
(d) Guttation
Answer:
(d) Guttation.
(v) Grana of chloroplast is not the:
(a) Site of Light Independent Phase
(b) Site of Light Dependent Phase
(c) Site of Photolysis
(d) Site of Photon Absorption
Answer:
(a) Site of Light Independent phase.
Question 7.
The diagram given below presents an experiment to demonstrate a particular aspect of Photosynthesis. The letter ‘A’ indicates a certain condition inside the flask:
Answer the Questions:
(i) What is the aim of the experiment?
(a) To show that oxygen is released during photosynthesis
(b) To show that photosynthesis occurs in the presence of KOH
(c) To show that chlorophyll is necessary for photosynthesis
(d) To show that carbon dioxide is necessary for photosynthesis
Answer:
(d) To show that carbon dioxide is necessary for photosynthesis.
(ii) What is the special condition inside the flask?
(a) Air inside the flask is free of oxygen
(b) Air inside the flask is free of carbon dioxide
(c) Air inside the flask is free of nitrogen
(d) KOH purifies the air inside the flask
Answer:
(b) Air inside the flask is free of carbon dioxide.
(iii) An alternative chemical that can be used instead of KOH is:
(a) Sodium Hydroxide
(b) Sodium Chloride
(c) Potassium Chloride
(d) Potassium Permanganate
Answer:
(a) Sodium Hydroxide.
(iv) In what manner, do the leaves 1 and 2 differ at the end of the starch test?
(a) Leaf 1 turns brown, Leaf 2 turns blue black
(b) Leaf 1 turns blue black, Leaf 2 turns blue brown
(c) Leaf 1 turns purple, Leaf 2 remains green
(d) There is no change in the colour of the leaves
Answer:
(a) Leaf 1 turns brown, Leaf 2 turns blue black.
(v) What is the important step that should be taken before performing this experiment?
(a) The plant should be placed in dark for 24 hours to destarch the entire plant.
(b) The plant should be placed in dark for 24 hours to remove chlorophyll from the leaves
(c) The plant should be placed in dark for 24 hours to destarch the leaves
(d) The plant should be placed in dark for 24 hours for the roots to absorb water
Answer:
(c) The plant should be placed in dark for 24 hours to destarch the leaves.
Question 8.
Given below is the diagram of an experiment step-up to study the process of Transpiration. Cobalt chloride papers are fixed on the upper as well as lower surface of the leaf.
Answer the question that follow:
(i) What is the aim of the experiment?
(а) To prove that more transpiration occurs from the lower surface of a dicot leaf
(b) To prove that more transpiration occurs from the upper surface of a dicot leaf
(c) To prove that transpiration is equal on both sides of the leaf
(d) To prove that transpiration does not take place in a dicot leaf
Answer:
(a) To prove that more transpiration occurs from the lower surface of a dicot leaf.
(ii) What is the colour of dry Cobalt Chloride paper?
(a) Pink
(b) Blue
(c) Brown
(d) White
Answer:
(b) Blue
(iii) After about an hour, what change, if any, would you expect to find in the cobalt chloride paper placed on the upper and lower surface of the leaf?
(a) Upper Surface – Pink, Lower Surface – Blue
(b) Upper Surface – White, Lower Surface – Blue
(c) Upper Surface – less Pink, Lower Surface – more Pink
(d) Upper Surface – more Pink, Lower Surface – less Pink
Answer:
(c) Upper surface – less pink, lower surface – more pink
(iv) Two adaptation in plants to reduce transpiration are:
(a) Narrow Leaves, Thin cuticles
(b) Fewer Stomata, Broad lamina of leaves
(c) Thin cuticles, Sunken stomata
(d) Narrow leaves, Fewer stomata
Answer:
(d) Narrow leaves, Fewer stomata
(v) The rate of transpiration is less when there is:
(a) High humidity in the air and low temperature
(b) Less humidity in the air and decrease in atmospheric pressure
(c) Bright sunlight and high temperature
(d) More wind and low intensity of sunlight
Answer:
(a) High humidity in the air and low temperature.