Question

What is transpiration? Explain various factors affecting it.

Answer 1

Transpiration is the removal of water vapour from the plant through the stomata.

Factors affecting transpiration are :

1. Temperature : Increase in temperature causes an increase in the evaporation of water vapour and hence Transpiration increases.

2. Light : Adequate light conditions causes the opening of eand hence Transpiration increases.

3. Humidity: high humidity reduces the rate of transpiration as the nearby atmosphere is somewhat saturated by water vapour.

4. Number of stomata: Higher number of stomata cause increase in Transpiration.

5. Distribution of stomata : Stomata on the upper epidermis of the leaf are more involved in Transpiration whereas stomata on the lower epidermis are less involved in Transpiration.