Question

Why stomata are present in a leaf?

Answer 1

Most stomata are usually found beneath the leaves (on the underside). This is to protect the plant from water loss. There they are well hidden from the sun in the shade of the leaf itself so the sun cannot evaporate the water that keeps the structure of the stomata proper.

Answer 2

The exchange of oxygen and carbon dioxide in the leaf,as well as the loss of water vapours occurs through pores called stomata.