Question

bring out the functions of tree under concern for future generations

Answer 1

Simply by performing their natural processes, trees improve air quality. By giving off oxygen, they benefit not only the organisms in their vicinity, but help, in their small way, the overall quality of the atmosphere.
Trees put down strong, deep roots. This enables them to draw up nutrients from lower down in the soil, making them available for plants around them with shallower roots. These strong roots also help to improve the soil structure, creating more passages through which aeration of the soil can occur, as well as the percolation of moisture, and the movement of organisms living in the soil.

A tree provides a habitat for animals. Insects are attracted to its blossoms and fruit, while birds are attracted by the fruit, the availability of insects to eat, and the coverage the tree’s branches offer both for protection from the elements and predators, and a place to nest. 

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Answer 2

One of the important element which keeps the life going on this earth is oxygen. The life-supporting oxygen is the product which we receive from the trees. Hence, trees are the basic manufacturer of oxygen which helps to grow life on Earth. Since last century there has been immense cutting down of the trees for different uses. The man has been cutting trees so as to make the life easy. In this run, the man himself has become the cause of his downfall. Trees purify the air and help in keeping the atmosphere cool. Cutting down of the trees has encouraged global warming which is a global concern. A rise in temperature has been noticed which is not a good symbol for life on Earth. Hence, tree plantation should be encouraged and the cutting of the trees should be minimized.