Question

Compared to a dry day, how would the rate of transpiration be affected on a humid day?

• A. There would be no difference between the rate of transpiration on a dry or a humid day!
• B. Higher rate of transpiration on a dry day compared to a humid day
• C. Higher rate of transpiration on a humid day compared to a dry day
• D. On a dry day there would be no transpiration at all, while on a humid day there would be maximum transpiration.

Answer 1

The correct option is B

Higher rate of transpiration on a dry day compared to a humid day

Since on a dry day there will be hardly any water vapour in the atmosphere, more diffusion of water vapour would occur from the leaves, thereby ensuring higher rate of transpiration. On the other hand, on a humid day, since there would be water vapour already present in the air, lesser water would diffuse out of the leaves. Hence, lesser transpiration.