PYQ Vault

Day 3: CBSE Class 10 Science

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

  1. Question 1

    Our Environment. Asked 4 times: 2023*, 2024*, 2025*, 2026 (* = numbers or wording changed that year)

    10
    What are decomposers ? List two important roles they play in the environment.

  2. Question 2

    Our Environment. Asked 4 times: 2022*, 2023*, 2024*, 2026 (* = numbers or wording changed that year)

    11
    Explain why food chains generally consist of three or four steps.

  3. Question 3

    The Human Eye and the Colourful World. Asked 4 times: 2023*, 2024*, 2025*, 2026 (* = numbers or wording changed that year)

    36
    Explain the phenomenon of rainbow formation in the sky. Draw the labelled ray diagram in support of your explanation.

  4. Question 4

    How do Organisms Reproduce?. Asked 4 times: 2022*, 2023*, 2024*, 2025 (* = numbers or wording changed that year)

    35 (B)
    (i) Name the part performing following functions in human male reproductive system : (a) Carries sperm (b) Production of male gametes (c) Whose secretion makes the transport of sperms easier (d) Provide suitable temperature for sperm formation (ii) Write any two characteristics of sperms. (iii) What are surgical contraceptive methods? Give the side effect caused by this procedure.

  5. Question 5

    Our Environment. Asked 4 times: 2022*, 2023*, 2024*, 2025 (* = numbers or wording changed that year)

    33
    Write the essential function performed by ozone at the higher levels of the atmosphere. How is it formed in the upper atmosphere ? Write the name of the group of chemicals mainly responsible for the depletion of ozone layer.