Leaf is a part of the plant and is attached to stems of the tree. It has a number of holes through which the gases are exchanged. Plants absorb carbon dioxide from the air with the help of leaves.
The main purpose of a leaf is photosynthesis. Photosynthesis is a process by which the plants trap energy from the sunlight and convert it into the chemical energy. The tissue responsible for this procedure of photosynthesis is situated at the top side of the leaf but in some of the leaves, this tissue is positioned at both sides i.e top and bottom. During the process of photosynthesis, plants make oxygen from the carbon dioxide.
All leaves are dissimilar in sizes, shapes, shades and pores. Some leaves are grown on top of the earth whereas some of the leaves are immersed in water.
Some plants have their leaves at all times of the year whereas some of the plants fall off their leaves. These leaves generally grow more in a rainy season.