Name of the food chain which is generally present in all type of ecosystem. Explain and write their significance. 

Explanation

The movement of energy from producers upto top carnivores is known as food chain, Le., In any food chain, energy flows from producers to primary consumers, then from primary consumers to secondary consumers, and finally secondary consumers to tertiary consumers. Hence, it shows linear network links. Generally, there are two types of food chain. (1) Grazing food chain and (2) Detritus food chain. Grazing food chain is present in all ecosystem. Main source of energy for the grazing food chain is the Sun, It begins with the first link, producers (plants). The second link in the food chain is primary consumers (mouse) which get their food from producers. The third link in the food chain is secondary consumers (snake) which get their food from primary consumers. Fourth link in the food chain is tertiary consumers (eagle) which get their food from secondary consumers.