NEET 1999 · Class 12

Ecosystem

Energy transfer from one trophic level to other, in a food chain, is

  1. (A)10%
  2. (B)20%
  3. (C)1%
  4. (D)2%

The NCERT line that answers it

Verbatim line

The number of trophic levels in the grazing food chain is restricted as the transfer of energy follows 10 per cent law – only 10 per cent of the energy is transferred to each trophic level from the lower trophic level.

Chapter
Ecosystem
Section
12.4 ENERGY FLOW
Page
6
Words matched
40 of 40

The answer appears as a continuous sentence in NCERT. This is that sentence.

How this line gives the answer

0, emb=1.0, combined=1.0). Verified: high — The span explicitly states 'the transfer of energy follows 10 per cent law – only 10 per cent of the energy is transferred to each trophic level from the lower trophic level,' which directly and conclusively identifies the 10% energy transfer rate.

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Question text is reproduced from the published NEET 1999 paper for study and commentary. NCERT text is quoted, not redistributed; textbooks remain at ncert.nic.in. Our mapping method, including its measured error rates, is published at /methodology.