PrepRung
Sign inSign up free

NDA 2018 GAT · General Knowledge · Ecology and Environment · hard

In a food chain, 10000 J of energy is available at the producer level. Assuming the 10 percent law, the energy available to the tertiary consumer is

Single correct option

In a food chain, 10000 J of energy is available at the producer level. Assuming the 10 percent law, the energy available to the tertiary consumer is
  1. A. 1000 J
  2. B. 10 J
  3. C. 100 J
  4. D. 1 J
Show answer and solution

Answer: (B) 10 J

By the 10 percent law, each trophic level passes on about one-tenth of the energy it receives. Producers have 10000 J, primary consumers 1000 J, secondary consumers 100 J and tertiary consumers 10 J. Choosing 100 J counts one level too few, which is the usual error.
Report a mistake

Original question written in the NDA 2018 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