SCIENCE
Paper 3 (Biology)
(Two Hours)
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 A and any four in Section B.
The intended marks for questions or parts of a question are given in the brackets [ ]
Section A [40 Marks]
(Attempt all questions from this Section.)
Question 1
Choose the correct answers to the questions from the given options. [15]
(Do not copy the question. Write the correct answer only):
(i) The solvent used to dissolve the chlorophyll pigment while testing a leaf for starch.
(a) Soda lime (b) Carbolic acid (c) Methylated spirit (d)) Water
(ii) Pentose sugar, phosphate and nitrogenous base together form a_______.
(a) DNA strand (b) Gene (c) Nucleotide (d) Chromosome
(iii) A plant with variegated leaves is _______.
(a) Coleus (b) Lotus (c) Peepal (d) Mango
(iv) A colourblind daughter will be born when:
(a) Mother is colourblind and father is a carrier but not colourblind.
(b) Mother is a carrier and father is colourblind.
(c) Mother and father both are carriers.
(d) Mother is normal and non-carrier but father is colourblind.
(v) Omkar is fond of playing with Mimosa pudica plant, because when he touches its leaves, the leaves
rapidly droop down. This is an example of ________.
(a) Transpirational pull (b) Root pressure (c)Turgor movement (d) Osmotic pressure
(vi) Marine fish when placed in tap water bursts because of: __________.
(a) Endosmosis (b) Exosmosis (c) Diffusion (d) Plasmolysis
(vii) Stress hormone present in plants __________.
(a) Ethylene (b) Auxins (c) Abscisic acid (d) Gibberellin
(viii) A cell has 5 pairs of chromosomes. After mitotic division, the number of chromosomes in the
daughter cells will be: ___________.
(a) 5 (b) 10 (c) 20 (d) 40
(ix) Relative concentration of the solutions that determine the direction and extent of diffusion is called
________________.
(a) Turgidity (b) Tonicity (c) Flaccidity (d) Imbibition
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(x) Photophosphorylation is synthesis of ___________.
(a) NADP (b) PGA (c) ATP from ADP (d) ADP from ATP
(xi) Instrument used to determine the rate of transpiration =_______________.
(a) Porometer (b) Potometer (c) Auxanometer (d) Photometer
(xii) Assertion (A): Crossing over is a phenomenon which causes variation.
Reason (R): In crossing over, exchange of chromosome material takes place
between the non-sister chromatids leading to new combinations.
(a) Both A and R are true (b) Both A and R are false
(c) A is true and R is false (d) R is true and A is false
(xiii) During photosynthesis, chlorophyll acts as _____________.
(a) energy convertor (b) end product (c) raw material (d) hydrogen acceptor
(xiv) Common Gibberellin is _______________.
(a) GA1 (b) GA2 (c) GA3 (d) GA7
(xv) Which of the following is not a semi-permeable membrane?
(a) Cell membrane (b) Cellophane paper (c) Muslin cloth (d) Visking bag.
Question 2
(i) Name the following: - [5]
(a) Movement of plant parts in response to touch.
(b) Phenomenon by which the living or dead plant cells absorb water by surface attraction.
(c) Proteins that help in coiling & packaging of DNA into structural units.
(d) Structure through which guttation takes place.
(e) The pressure of the cell contents on the cell wall.
(ii) Identify the ODD term in each set and name the CATEGORY to which the remaining 3 belongs: [5]
(a) Haemophilia, Colour blindness, Night blindness, Albinism.
(b) Stomata, Cuticle, Lenticels, Hydathode.
(c) Pepsin, Thymine, Cytosine, Adenine.
(d) Imbibition, Diffusion, Oxidation, Osmosis.
(e) Capillarity, Adhesion, Root pressure, Bleeding.
(iii) Fill in the blanks with suitable words: [5]
Chloroplasts are microscopic cell organelles found in plants containing (a) __________ pigment.
Their interior contains closely packed flattened sacs (b) _________ arranged in piles (c) ________
lying in a colourless ground substance called (d) __________. They are mainly contained in (e)
_______ cells located between the upper and lower epidermis of the leaves.
(iv) Arrange and rewrite the terms in each group in the correct order to be in a [5]
logical sequence beginning with the term that is underlined.
(a) Photons, Water molecules, Oxygen, Grana, hydrogen ions.
(b) G1-phase, Karyokinesis, S-phase, Cytokinesis, G2-phase.
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(c) Root hair, Xylem, Cortex, Endodermis, Epidermis.
(d) Upper Cuticle, Spongy Mesophyll cells, Upper epidermis, Lower epidermis,
Palisade Mesophyll cells.
(e) Interphase, Anaphase, Prophase, Telophase, Metaphase.
(v) Complete the analogy: [5]
(a) Mitosis: Somatic cells :: Meiosis : ____________.
(b) Movement towards light: Phototropism :: Movement in response to water:_________.
(c) Transpiration: Water vapour :: Guttation: ____________.
(d) Water transport: Xylem :: Food translocation: ____________.
(e) Stomata open: Turgidity :: Stomata closed: ____________.
Section B [40 Marks]
(Attempt any four questions from this Section)
Question 3
(i) Define Active transport. [1]
(ii) State Mendel’s law of Independent Assortment. [2]
(iii) Differentiate between Guttation & Bleeding. [2]
(iv) Mendel chose garden pea plant for his experiment. Explain by giving two suitable reasons. [2]
(v) A homozygous tall plant (TT) bearing red coloured (RR) flowers variety of pea plant is crossed [3]
with a homozygous dwarf (tt) plant bearing white (rr) flowers. Answer the questions that follow:
(a) Give the genotype and phenotype of the plants of F1 generation.
(b) What is the genotypic & phenotypic ratio obtained in F2 generation?
Question 4
(i) Expand the abbreviation- IAA. [1]
(ii) Differentiate between Auxin & Cytokinin. [2]
(iii) Mention two adaptations in plants to reduce excessive transpiration. [2]
(iv) Balsam plants wilt during mid-day even if the soil is well watered. Explain. [2]
(v) Given below is an experimental set up to demonstrate a particular process. [3]
Study the same and answer the questions that follow:
(a) Explain the process being studied.
(b) What is been observed in the experimental
set-up shown in the diagram?
(c) Why is the pot covered with a plastic sheet?
Question 5
(i) Mention the exact location of stomata. [1]
(ii) Give any two uses of turgidity to plants. [2]
(iii) Grapes shrink when kept in sugar solution. Explain. [2]
(iv) State the function of the following-: (a) Chromosomes (b) Guard cells. [2]
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(v) Study the diagram given below and answer the questions that follow: [3]
(a) What is the aim of the experiment?
(b) What is the result observed in setup (a) and setup (b)?
Question 6
(i) Explain the term: Polymerisation. [1]
(ii) State the exact location of the following: (a) Centromere (b) Lenticel. [2]
(iii) Give any one external factor that affects the rate of following processes: [2]
(a) Transpiration (b) Photosynthesis
(iv) What is Interphase? Mention one significant change that occur in cell during Interphase. [2]
(v) Draw a neat labelled diagram of root hair cell. [3]
Question 7
(i) What is the scientific name for a garden pea plant? [1]
(ii) Give one significance of the following: (a) Mitosis (b) Meiosis. [2]
(iii) Mention the site of synthesis for the following plant hormones: [2]
(a) Cytokinin (b) Abscisic acid.
(iv) Differentiate between Osmosis and Diffusion. [2]
(v) The given diagram shows a stage during mitotic cell division in plant cell. [3]
Study the diagram & answer the following questions.
(a) Identify the stage.
(b) Give a suitable reason for your answer in (a).
(c) Name the stage that follows the one shown in the diagram.
Question 8
(i) Define Parthenocarpy. [1]
(ii) State the function of the following-: (a) Gibberellins (b) Chlorophyll [2]
(iii) Explain Photosynthesis. Write a balanced chemical equation to represent the process of [2]
photosynthesis.
(iv) All life will end if green plants are not there. Explain. [2]
(v) Given below is the diagram of an experimental set-up. [3]
Study the diagram & answer the question that follow:
(a) What is the objective of the above experiment?
(b) What is the role of the chemical present in the flask?
(c) What is observed when the part of leaf present inside the flask is tested for starch?
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[TPS-Std. 10- Biology - Term 1 – 26/07/2023]
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