Question

(1) Create a terrestrial food chain depicting four trophic levels.
(11) Why do we not find food chains of more than four trophic levels of nature.​

Answer 1

Answer:

(i) A terrestrial food chain depicting four trophic levels is as follows- grass (producer), eaten by a mouse (primary consumer), eaten by a snake (secondary consumer), eaten by a hawk (tertiary consumer).

(ii) We do not find food chains of more than four trophic levels in nature because energy and biomass decrease from lower to higher trophic levels so the length of the food chains is restricted.

Answer 2

Answer: Since there is very little energy available for the next level of the series of consumers, there are usually only three or four stages. The loss of energy step is so great that very less usable energy remains