Forests: Our Lifeline — Science STD 7 — Question

Grass is eaten by insects, which in turn, is taken by the frog. The frog is consumed by snakes.
This is said to form a food chain:
Grass → insects → frog → snake → eagle. Many food chains can be found in the forest. All food chains are linked. If anyone food chain is disturbed, it affects other food chains. These food chains produce a lot of supplementary products which are vital for the plants growth. The micro-organisms which convert the dead plants and animals to humus are known as decomposers.