Discuss the factors responsible for transpiration in plants.

Explanation

The important external factors that influence the rate of transpiration are:
1. Light:- Light directly increases the rate of transpiration by inducing the opening of stomata. Starch is formed in the guard cells in presence of light. Starch gets comerted into sugars which absorb water into guard cells. Guard cells become turgid and stoma opens and the rate of transpiration increases. When there is no light stomata are get closed and the rate of transpiration decreases.
2. Temperature:- When temperature increases atmospheric humidity decreases and rate of transpiration increases and when temp decreases transpiration decrease.
3. Atmospheric humidity:- It is the amount of water vapour present in the atmospheric air when atmospheric humidity is more the rate of transpiration is less and when atmospheric humidity is less the rate of transpiration is more.
4. Wind velocity:- Plants produce a cloud of water vapour just above the leaves which reduces the rate of transpiration. When wind velocity removes the water vapour around the plant, then the rate of transpiration increases, high wind velocity tends to close stomata and the rate of transpiration decreases.
5. Availability of soil water:- When there is less soil water, the rate of water absorption is less and rate of transpiration is also less.