Name the type of food chains responsible for the flow of larger fraction of energy in an aquatic and a terrestrial ecosystem respectively. Mention one difference between the two food chains.

Explanation

(i) Aquatic ecosystem ................. Grazing food chain
Terrestrial ecosystem .......... ........ Detritus food chain
(ii) In grazing food chain, producers (phytoplanktons and aquatic plants) constitute the first step but in detritus food chain, dead bodies of animals or fallen leaves etc. of plants constitute the first step for the flow of energy.