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Science · 2023 · 3 marks
CBSE 2023 · Region 6 · Set 3 · Q29
(a)Write the percentage of (i) solar energy captured by the autotrophs and (ii) energy transferred from autotrophs to the next level in a food chain.(b)What are trophic levels ? Why do different food chains in an ecosystem not have more than four to five trophic levels? Give reason.
(a)
Write the percentage of (i) solar energy captured by the autotrophs and (ii) energy transferred from autotrophs to the next level in a food chain.
(b)
What are trophic levels ? Why do different food chains in an ecosystem not have more than four to five trophic levels? Give reason.
Marking-scheme solution
(a) (i) $\displaystyle 1$%
(ii) $\displaystyle 10$% energy
(b)
• Every step of a food chain where transfer of energy occurs.
-Since the amount and available energy keeps on becoming less as we move to higher trophic level, very little usable energy remains after four trophic levels.
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CBSE Class 10 Science past-paper question from the 2023board exam, with the answer as CBSE’s own marking scheme gives it. Where our answers come from.