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Why do food chains rarely have more than four or five trophic levels?
Answer & Solution
Correct answer: D.
1. About 90% of energy is lost at each transfer (heat, metabolism, waste).
2. After 4–5 levels, the remaining energy is too small to support another consumer level.
3. Hence food chains are short.
_Source: NCERT Class 10 Science, Ch 13 "Our Environment", §13.1.1_
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