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Science · 2026 · 2 marks
CBSE 2026 · Region 4 · Set 1 · Q11
Explain why food chains generally consist of three or four steps.
Explain why food chains generally consist of three or four steps.
Marking-scheme solution
Only $\displaystyle 10$% of the energy from one trophic level is transferred to the next level. Most of the energy is lost as heat.
So very little usable energy will remain after four trophic levels./
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CBSE Class 10 Science past-paper question from the 2026 board exam, with the answer as CBSE’s own marking scheme gives it. Where our answers come from.