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Science · 2025 · 3 marks
CBSE 2025 · Region 3 · Set 1 · Q33
(a) "In a food chain energy flow is unidirectional." Give two reasons for the given statement. (b) If 10,000 J energy is available at the producer…
(a)
"In a food chain energy flow is unidirectional." Give two reasons for the given statement.
(b)
If $\displaystyle 10,000$ J energy is available at the producer level, how much energy will be available to the secondary consumers ? Give reason to justify your answer.
Marking-scheme solution
\(\displaystyle 1 \times 2\)
/ Only $\displaystyle 10$% energy of the organic matter of previous trophic level is transferred to next trophic level. /$\displaystyle 10$% law
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CBSE Class 10 Science past-paper question from the 2025 board exam, with the answer as CBSE’s own marking scheme gives it. Where our answers come from.