Question

forests play a major role to balanced the environment explain point wise

Answer 1

planned harvesting: an efficient way to get wood from forests for our requirements is to cut only some of the tres in an area. the uncut trees prevent erosion. fruits of these seeds produce seeds so that new trees can grow. this way the forest cover is maintained.

afforestation: selective cutting of trees in these plantations provide woods for construction and also keeps the forest in cover intact.

protection from over gazing: overgrazing from cattle,  sheep, horses etc., not only destroyes grasslands but also trees in forests. the young trees are either eaten or trampled. overgazing must therfore be prevented to save forests.
I hope it helps
with regards 
ankita