Question

define - food chain​

Answer 1

A food chain is a linear network of links in a food web starting from producer organisms and ending at apex predator species, detritivores, or decomposer species. A food chain also shows how the organisms are related with each other by the food they eat. Each level of a food chain represents a different trophic level.

Answer 2

$\sf{\green{\underline{\green{\underline{\green{\huge{Answer}}}}}}}$

Food chain is a chain which lets us know about the flow of energy from one organism to another.

A Food chain contains a series of organisms called trophic levels.

Extra Information:-

Trophic levels:- There are different trophic levels in a food chain. The plants belong the the first trophic level $\sf{(T_1)}$and are known as primary producers. Then comes second trophic level $\sf{(T_2)}$ which include primary consumers. Then Secondary consumers belong to third trophic level $\sf{(T_3)}$. Tertiary consumers belong to fourth trophic level $\sf{(T_4)}$. Quarternary consumers belong to fifth trophic level $\sf{(T_5)}$. Decomposers form the last or the detritus trophic level $\sf{(T_6)}$.

An ecosystem have few trophic levels because of the following reasons:-

(i) There is a constant loss of energy at each trophic level. So a time comes when the energy is completely exhausted and hence cannot be transfered to the further trophic levels.

(ii) Food is utilised incompletely.

______________________________________

According to 10% law of energy flow, only 10% percent of the energy from an organism is transfered to other organism. The remaining 90% is lost as heat in metabolic processes like respiration, reproduction, etc.

______________________________________