ICSE X | BIOLOGY
Sample Paper – 5 (Semester 1 – 2021)
Time: 1 hr Total Marks: 40
General Instructions:
1. The time given at the head of the paper is inclusive of reading time.
2. All questions are compulsory.
3. The marks intended for questions are given in brackets [ ].
SECTION I (15 Marks)
Select the correct option for each of the following questions.
Question 1
Name the following: [5]
(i) A specific part of the chromosome that determines hereditary characteristics.
1. Gene
2. DNA
3. RNA
4. Nucleosome
(ii) The process by which water enters root hairs.
1. Diffusion
2. Active transport
3. Osmosis
4. Passive transport
(iii) The type of cell division which takes place in the anthers of flowering plants to
produce pollen grains.
1. Metastasis
2. Meiosis
3. Mitosis
4. Cytokinesis
(iv) The metallic cation involved in the opening and closing of stomata.
1. Calcium
2. Sodium
3. Potassium
4. Magnesium
(v) The occurrence of minor differences in the characteristics of individuals.
1. Variations
2. Alleles
3. Transgenesis
4. Epistasis
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ICSE X | BIOLOGY
Sample Paper – 5 (Semester 1 – 2021)
Question 2
Give the biological/technical term for the following: [5]
(i) The condition in which the cell contents are shrunken.
1. Flaccidity
2. Turgidity
3. Rigid
4. Durability
(ii) The condition in which a pair of homologous chromosomes carries similar alleles for
a particular character.
1. Heterologous
2. Homologous
3. Heterozygous
4. Homozygous
(iii) The type of bond which joins the complementary nitrogenous bases.
1. Polar bond
2. Hydrogen bond
3. Ionic bond
4. Electrovalent bond
(iv) The structure in a leaf that allows guttation.
1. Lenticels
2. Hydathodes
3. Stomata
4. Cuticle
(v) The process in which several glucose molecules are transformed to produce one
molecule of starch.
1. Photolysis
2. Photophosphorylation
3. Polymerisation
4. Catenation
Question 3
Select the correct answer from the four options given below: [5]
(i) Osmosis and diffusion are the same except that in osmosis there is
1. a freely permeable membrane
2. a cell wall in between
3. a selectively permeable membrane in between
4. an endless inflow of water into a cell
(ii) The term “chromosomes” literally means
1. Inherited bodies
2. Twisted threads
3. Coloured bodies
4. Shining threads
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ICSE X | BIOLOGY
Sample Paper – 5 (Semester 1 – 2021)
(iii) With decrease in atmospheric pressure, the rate of transpiration will
1. increase
2. decrease rapidly
3. decrease slowly
4. remain the same
(iv) During photosynthesis, the oxygen in glucose comes from
1. CO2
2. water
3. both CO2 and water
4. oxygen via air
(v) If a pure tall plant is crossed with a pure dwarf plant, then offspring will be
1. all tall
2. all dwarf
3. 3 tall 1 dwarf
4. 50% tall 50% dwarf
SECTION II (15 Marks)
Question 4
Define the following terms: [5]
(i) Semi-permeable membrane
1. Allows all molecules or ions to pass through it by osmosis.
2. Allows certain molecules or ions to pass through it by osmosis.
3. Allows all molecules or ions to pass through it by diffusion.
4. Allows certain molecules or ions to pass through it by diffusion.
(ii) Aster
1. Each centriole is surrounded by radiating rays.
2. Each chromomere is surrounded by radiating rays.
3. Each telemere is surrounded by radiating rays.
4. Each spindle is surrounded by radiating rays,
(iii) Mutation
1. Increase in the number of DNA copies in the cell.
2. Formation of new gametes and cells.
3. Sudden change in one or more genes, or in the number or in the structure of
chromosomes.
4. Creation of cellular apparatus and machinery for recombination.
(iv) Lenticular transpiration
1. Translocation occurring through minute openings on the surface of old stems.
2. Transpiration occurring through minute openings on the surface of roots.
3. Translocation occurring through minute openings on the surface of roots.
4. Transpiration occurring through minute openings on the surface of old stems.
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ICSE X | BIOLOGY
Sample Paper – 5 (Semester 1 – 2021)
(v) Photolysis
1. Splitting of H2O molecules into hydrogen ions and oxygen in the presence of
light.
2. Formation of H2O molecules from hydrogen ions and oxygen in the presence of
light.
3. Splitting of H2O molecules into hydrogen ions and oxygen.
4. Formation of H2O from hydrogen ions and oxygen.
Question 5
Which of the following correctly points out the difference: [5]
(i) Cobalt chloride paper and goat’s bladder (process where it is used)
1. Used in transpiration and osmosis respectively.
2. Used in conduction and osmosis respectively.
3. Used in transpiration and diffusion respectively.
4. Used in conduction and diffusion respectively.
(ii) Cell wall and cell membrane (permeability)
1. Semi-permeable permeable and freely permeable respectively.
2. Differentially permeable and semi-permeable respectively.
3. Freely permeable and semi-permeable respectively.
4. Impermeable and semi-permeable respectively.
(iii) Mitosis and meiosis (chromosome number in daughter cells)
1. Doubled and tripled respectively.
2. Tripled and doubled respectively.
3. Reduced to half and remains same respectively.
4. Remains same and reduced to half respectively.
(iv) Transpiration and guttation (define the terms)
1. Loss of water in the form of water droplets through hydathodes and in the form
of water vapour through aerial plant parts.
2. Loss of water in the form of water vapour through hydathodes and in the form of
water droplets through aerial plant parts.
3. Loss of water in the form of water droplets through aerial plant parts and in the
form of water vapour through hydathodes.
4. Loss of water in the form of water vapour through aerial plant parts and in the
form of water droplets through hydathodes.
(v) Synapsis and synapse (explain the terms)
1. Pairing of homologous chromosomes and fine gap between two successive
neurons.
2. Pairing of heterologous chromosomes and fine gap between two successive
neurons.
3. Pairing of homologous chromosomes and fine gap between two successive
nephrons.
4. Pairing of heterologous chromosomes and fine gap between two successive
nephrons.
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ICSE X | BIOLOGY
Sample Paper – 5 (Semester 1 – 2021)
Question 6
State the function of the following:
(i) Xylem
1. Conducts water and minerals
2. Conducts food
3. Prepares food
4. Provides essential mineral elements
(ii) Genes
1. Specific sequences of nucleosomes on a chromosome that encode particular
proteins.
2. Specific sequences of nucleotides on a chromosome that encode particular
proteins.
3. Specific sequences of nucleosomes on a chromosome that encode particular
carbohydrates.
4. Specific sequences of nucleotides on a chromosome that encode particular
carbohydrates.
(iii) Sex chromosomes
1. Determine somatic traits
2. Determine sex of the child
3. Determine inheritance of only recessive traits
4. Determine inheritance of only autosomal traits
(iv) Potometer
1. Measures the rate of transpiration in green plants.
2. Measures the rate of conduction in green plants.
3. Measures the rate of photosynthesis in green plants.
4. Measures the rate of translocation in green plants.
(v) Thylakoid
1. Trapping of light energy
2. Conversion of light energy into heat energy
3. Splitting of water molecule
4. Synthesis of carbohydrates
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ICSE X | BIOLOGY
Sample Paper – 5 (Semester 1 – 2021)
SECTION III (10 Marks)
Question 7
An experiment was set up as shown in the diagram below. [5]
(i) What is the aim of the experiment?
1. To show that carbon dioxide is necessary for photosynthesis.
2. To show that chlorophyll is necessary for photosynthesis.
3. To show that sunlight is necessary for photosynthesis.
4. To show that water and minerals are necessary for photosynthesis.
(ii) Why is KOH solution kept inside the bell jar?
1. To absorb the oxygen present in the jar.
2. To absorb the carbon dioxide present in the jar.
3. To create vacuum inside the jar.
4. To absorb the nitrogen present in the jar.
(iii) What is the use of soda lime?
1. To absorb the incoming nitrogen from the air.
2. To absorb the incoming oxygen from the air.
3. To absorb the incoming carbon dioxide from the air.
4. To absorb the incoming inert gases from the air.
(iv) What would be the next and final step in this experiment?
1. To test for the presence of glucose.
2. To test for the presence of lipids.
3. To test for the presence of vitamins.
4. To test for the presence of starch.
(v) What would be the result of the final step?
1. The leaf does not turn blue black with iodine solution.
2. The leaf turns blue black with iodine solution.
3. The leaf turns pink with iodine solution.
4. The leaf turns colourless with iodine solution.
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ICSE X | BIOLOGY
Sample Paper – 5 (Semester 1 – 2021)
Question 8
The diagram shows a schematic representation of the start of a certain phenomenon in cell
division. [5]
(i) Name the phenomenon.
1. Replication
2. Crossing over
3. Transcription
4. Synapse
(ii) Name the type of cell division in which this phenomenon occurs.
1. Mitosis
2. Meiosis
3. Both mitosis and meiosis
4. None of the above
(iii) Label parts 1 and 2.
1. 1 – Chromatid, 2 – Chromomere
2. 1 – Chromomere, 2 – Centromere
3. 1 – Chromatid, 2 – Centromere
4. 1 – Chromatid, 2 – Telomere
(iv) What is the most significant aspect of this type of cell division?
1. The chromosome number is halved.
2. The chromosome number is duplicated.
3. The chromosome number is tripled.
4. The chromosome number remains constant.
(v) Explain briefly the above phenomenon:
1. During meiosis, the chromosomes arrange in homologous pairs, split
longitudinally to make a tetrad. Chromosome pairs get separated, the
centromere splits and chromatids of each chromosome separate to become
independent chromosomes.
2. During mitosis, the chromosomes arrange in homologous pairs, split
longitudinally to make a tetrad. Chromosome pairs get separated, the
centromere splits and chromatids of each chromosome separate to become
independent chromosomes.
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ICSE X | BIOLOGY
Sample Paper – 5 (Semester 1 – 2021)
3. During meiosis, the chromosomes arrange in heterologous pairs, split
longitudinally to make a dyad. Chromosome pairs get separated, the centromere
splits and chromatids of each chromosome separate to become independent
chromosomes.
4. During mitosis, the chromosomes arrange in heterologous pairs, split
longitudinally to make a dyad. Chromosome pairs get separated, the centromere
splits and chromatids of each chromosome separate to become independent
chromosomes.
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