Question

The rate of transpiration will be very less in a situation where

• A. ground water is sufficiently available
• B. wind is blowing with a very high velocity
• C. environment is very hot and dry
• D. relative humidity is very high

Answer 1

The correct option is D

relative humidity is very high

Transpiration rate reduces proportionally with increase in atmospheric humidity as there is shallow gradient formed as compared to steep gradient formed when air is dry. When ground water is sufficient the plant is sufficiently hydrated and the transpiration rate is normal. High velocity winds carry away evaporated water and hence increase the transpiration rate. A hot environment dries up water fast and hence increases the rate of transpiration as well.