Question

(i) Create a terrestrial food chain depicting four trophic levels.
(ii) Why do we not find food chains of more than four trophic levels in nature?
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Answer 1

i) Grass < Deer < Tiger < Human

ii) We don't find food chains of more than four trophic level it's due to the fact that toxicity increases as we go up the trophic levels so after 4 trophic level the consumer dies because of high toxicity.

Answer 2

Explanation:

grass-rabbit-snake-vulture

grass is primary producer rabbit is primary consumer snake is secondary consumer and vulture is tertiary consumer.Each organism depicts a particular tropical level.

food chains are not more than 4 trophic level because transfer of energy follows 10% law I.e only 10 %of total energy is transferred into next trophic level.

Hope it helps you out