Functions of Leaf

Leaf performs following functions:

1. Photosynthesis - Leaves manufacture food in the presence of sunlight.

2. Exchange of gases - Stomata help in exchange of gases which are important for respiration and photosynthesis.

3. Transpiration - Evaporation of excess of water in vapour form takes place through stomata which helps in ascent of sap and cooling of leaf surface.

4. Guttation - Exudation of excess of water containing salts takes place in liquid form from leaf margins in plants growing in humid climate.

5. Modifications for special functions - In certain plants leaves perform functions like manufacturing and storing food, providing support and protection, vegetative propagation and trapping insects.