Question

How does light affect transpiration?

Answer 1

Transpiration:

1. Loss of water in the form of vapors from the aerial parts of the plants including stems, and leaves, specifically through the stomata is termed transpiration.
2. Transpiration is a useful process as it helps to cool down the surface of the plant in an extremely hot climate.
3. A force of pull acts in the xylem tissues which helps in the movement of water in the upward direction.
4. This force of pull is referred to as transpirational pull.

Effect of light on transpiration:

1. Transpiration is mainly carried out by the stomata.
2. The opening and closing of stomata is the function of light.
3. During the daytime, stomata remain open to facilitate the exchange of gases, so that carbon dioxide could enter the plants thus, carrying out photosynthesis.
4. Hence during the daytime rate of transpiration is also high.