The 10% law of energy transfer states that:
Answer & Solution
Correct answer: D.
1. Most ingested energy is lost as heat, used in metabolism, or excreted.
2. On average ~10% becomes biomass available to the next consumer.
3. This explains why food chains are short (3–4 trophic levels).
_Source: NCERT Class 10 Science, Ch 13 "Our Environment", §13.1.1_
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