Question

Rate of transpiration is reduced with

• A. Rise in temperature
• B. Decrease in light intensity
• C. Increase in wind velocity
• D. Increase in water uptake

Answer 1

Answer: (B)

Decrease in light intensity

The rate of transpiration is roughly proportional to the intensity of light. The increasing light intensity raises the temperature of leaf cells and thus increases the rate at which liquid water is transformed into vapours. The direct effect of light is on opening and closing of stomata. With the decrease in light intensity, the air becomes humid and due to which transpiration rate reduced.

so the correct answer is 'Decrease in light intensity'.