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CBSE Class 10 · Science · 24 past questions

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1. Q1 2026

   Which of the following group is not 'biodegradable' ?

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2. Q2 2026

   Organisms of a higher trophic level which feed on several types of organisms belonging to a lower trophic…

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3. Q3 2026

   In accumulation of toxic substances at higher trophic levels of an ecosystem through the food chain, which of…

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4. Q4 2026

   For Questions number 8 and 9, two statements are given — one labelled as Assertion (A) and the other labelled…

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5. Q5 2026

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6. Q6 2026

   In the given figure, identify the trophic level having maximum concentration of harmful chemicals. (with a figure)

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7. Q7 2026

   Which of the following limits the number of trophic levels in a food chain ?

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8. Q8 2026

   For Questions number 8 and 9, two statements are given — one labelled as Assertion (A) and the other labelled…

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9. Q9 2026

   Suggest one best way to dispose of the following wastes…

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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…

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11. Q11 Sample paper 2026-27

    The following two questions consist of two statements – Assertion (A) and Reason (R). Answer these questions…

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12. Q13 2025

    Identify from the following a group containing all non-biodegradable substances.

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13. Q14 2025

    For Questions number 17 to 20, two statements are given — one labelled as Assertion (A) and the other…

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14. Q15 2025

    The percentage of solar energy which is not converted into food energy by the leaves of green plants in a…

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15. Q18 2024

    A food chain will be more advantageous in terms of energy if it has

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16. Q21 2024

    For Q. Nos. 17 to 20, two statements are given – One labelled as Assertion (A) and the other labelled as…

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