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NDA 2017 GAT · General Knowledge · Ecology and Environment · hard

In a food chain, if the producers contain 10000 J of energy, the energy available to the tertiary consumers according to the ten per cent law is

Single correct option

In a food chain, if the producers contain 10000 J of energy, the energy available to the tertiary consumers according to the ten per cent law is
  1. A. 10 J
  2. B. 1000 J
  3. C. 100 J
  4. D. 1 J
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Answer: (A) 10 J

Only about 10 per cent of the energy is passed from one trophic level to the next. Producers 10000 J give primary consumers 1000 J, secondary consumers 100 J and tertiary consumers 10 J. Choosing 100 J counts the secondary level as tertiary. This loss of energy explains the limited number of trophic levels.
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Original question written in the NDA 2017 GAT pattern and checked twice for the correct answer. Not an official question paper. How we write and check questions · Corrections policy · Report a mistake