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Science · 2025 · 2 marks
CBSE 2025 · Region 5 · Set 1 · Q26
(a) Why are the organisms of first trophic level important in any food chain? (b) Justify the following statement: 'The flow of energy in an…
(a)
Why are the organisms of first trophic level important in any food chain ?
(b)
Justify the following statement : 'The flow of energy in an ecosystem is unidirectional.'
Marking-scheme solution
(a)
The organisms of the first trophic level fix up the solar energy and makes it available for heterotrophs or the consumers.
(b)
As energy moves progressively through various trophic levels it is no longer available to previous level / The energy that is captured by autotrophs does not revert back to solar input. /The energy passed to herbivores does not come back to autotrophs(producers).
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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.