Entire explanation: 5 Marks
In forests, plants produce food. All animals, whether herbivores or carnivores, depend ultimately on plants for food.
Organisms which feed on plants often get eaten by other organisms, and so on.
For example, grass is eaten by insects, which in turn, are eaten by the frogs. Frogs are consumed by snakes and snakes are eaten up by eagles.This is said to form a food chain:
                   Grass→ insects→ frogs→ snakes→ eagles.
Decomposers also play an important role in the forest. They feed upon dead plants and animal tissues and convert them into a dark coloured substance called humus.
For example: Fungi grow on decaying fruits and vegetables and convert them into humus.
By harbouring greater variety of plants, the forests provide good opportunities for food and habitat for the herbivores and carnivores. The wide variety of animals helps the forest to regenerate and grow. Thus forest is the dynamic living entity that is full of life and vitality.