PYQ Vault

Day 90: CBSE Class 10 Science

5 questions. Try each one first, then open its answer.

  1. Question 1

    Life Processes. Asked once: 2024 (same type asked 3 times)

    30
    In the context of the statement “chlorophyll is necessary for photosynthesis” answer the following questions : (i) What are variegated leaves? Give an example. (ii) When leaf is boiled in alcohol, what happens to the colour of the leaf and the colour of the solution ? (iii) In what form is the carbohydrate produced, stored in the plant? Why is chlorophyll necessary for photosynthesis ?

  2. Question 2

    Life Processes. Asked once: 2026 (same type asked 3 times)

    1
    Which structure in a leaf is mainly responsible for gaseous exchange ?

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  3. Question 3

    Life Processes. Asked once: 2025 (same type asked 3 times)

    8
    Listed below are the steps of nutrition in Amoeba. Select the correct sequence of these steps : (i) Diffusion of simple nutrients into cytoplasm (ii) Food vacuole formation (iii) Formation of finger like temporary extensions of cell surface (iv) Complex substances broken to simpler ones (v) Undigested material thrown out of the cell surface

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  4. Question 4

    Life Processes. Asked once: 2026 (same type asked 3 times)

    Two statements are given, one labelled Assertion (A) and the other labelled Reason (R). Select the correct answer from the options given below.
    9
    Assertion (A) : In human beings, the respiratory pigment is haemoglobin present in red blood cells. Reason (R) : Haemoglobin has a very high affinity for carbon dioxide.

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  5. Question 5

    Life Processes. Asked once: 2024 (same type asked 3 times)

    35 (b)
    (i) In the experimental set-up shown above in diagram (I) atmospheric air is being passed into lime water with a syringe while in diagram (II) air is being exhaled into lime water. The time taken for the lime water to turn milky in both the test tubes is different. Give reason. (ii) Draw the diagram of an open stomatal pore and label (I) Guard cells, and (II) Chloroplast on it. Mention two functions performed by stomata.