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CBSE Class 10 · Science · 24 past questions

  1. Q1 2026
    Which of the following group is not 'biodegradable' ?
  2. Q2 2026
    Organisms of a higher trophic level which feed on several types of organisms belonging to a lower trophic…
  3. Q3 2026
    In accumulation of toxic substances at higher trophic levels of an ecosystem through the food chain, which of…
  4. Q4 2026
    For Questions number 8 and 9, two statements are given — one labelled as Assertion (A) and the other labelled…
  5. Q5 2026
  6. Q6 2026
    In the given figure, identify the trophic level having maximum concentration of harmful chemicals. (with a figure)
  7. Q7 2026
    Which of the following limits the number of trophic levels in a food chain ?
  8. Q8 2026
    For Questions number 8 and 9, two statements are given — one labelled as Assertion (A) and the other labelled…
  9. Q9 2026
    Suggest one best way to dispose of the following wastes…
  10. Q10 Sample paper 2026-27
    A fish living in a pond ecosystem feeds on small aquatic insects (larvae). These insect larvae, in turn, feed…
  11. Q11 Sample paper 2026-27
    The following two questions consist of two statements – Assertion (A) and Reason (R). Answer these questions…
  12. Q12 Sample paper 2026-27
    Study the food chain given below… (with a figure)
  13. Q13 2025
    Identify from the following a group containing all non-biodegradable substances.
  14. Q14 2025
    For Questions number 17 to 20, two statements are given — one labelled as Assertion (A) and the other…
  15. Q15 2025
    The percentage of solar energy which is not converted into food energy by the leaves of green plants in a…
  16. Q16 2025
    Assertion (A) : The amount of ozone in the atmosphere began to drop sharply in the 1980s.…
  17. Q17 2024
    Use of pesticides to protect our crops affect organisms at various trophic levels especially human beings.…
  18. Q18 2024
    A food chain will be more advantageous in terms of energy if it has
  19. Q19 2024
    Consider the following statements about ozone…
  20. Q20 2024
    Identify the food chain in which the organisms of the second trophic level are missing…
  21. Q21 2024
    For Q. Nos. 17 to 20, two statements are given – One labelled as Assertion (A) and the other labelled as…
  22. Q22 2024
    (A) Plants → Deer → Lion…
  23. Q23 2023
    How do harmful chemicals get accumulated progressively at each trophic level in a food chain ?
  24. Q24 2023
    Use of several pesticides which results in excessive accumulation of pesticides in rivers or ponds, is a…