Question

In the given food chain, suppose the amount of energy at fourth trophic level is 5 kj, what will be the energy available at the producer level?

Answer 1

• So we know that trophic level 4, has a total of 5kj of energy, i.e., 5000 J of energy...
  According to 10% law, the trophic level succeeding a trophic level obtains only 10% of the energy from its previous trophic level.
  Which means, the third trophic level had
  => 5000= 10/100* x
  =>x= 50,000 J
  So the second trophic level had
  => 50,000= 10/100* x
  => x = 500,000 J
  So we arrive at our answer , the first trophic level, or the producers stored a total energy of,
  => 500,000= 10/100* x
  => x = 50,00,000 J
  Answer- the producer's trophic level stored a total of 5,000 kj of energy
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Answer 2

Answer:

According to the 10 per cent law, only 10 per cent of the energy available in a trophic level is passed on to the next level. Hence, if the amount of energy available at the fourth trophic level is 5 kJ, the energy available at the producer level will be 5,000 kJ: 5 → 50 → 500 → 5,000.

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