Question

The rate of transpiration increases with _________.

• A. Increase in humidity of air
• B. Increase in wind velocity
• C. Reducing light intensity
• D. Decrease in wind velocity

Answer 1

The correct option is B

Increase in wind velocity

The correct option is B.

Explanation for the correct option:

1. The fast moving air will replace the humid air with dry air.
2. The exposure to the air will increase the release of water vapour from stomata by transpiration and the rate of transpiration increases.

Explanations for the incorrect options:

Option A:

The more the humidity, the lesser will be the transpiration as the humid air already has high amount of water content in it.

Option C:

The reduced light intensity will stimulate the closer of the stomatal pores, thus, reducing the rate of transpiration.

Option D:

Slow moving air will not replace the humid air. The more humid the air is, the lesser is the rate of transpiration.

Final answer: The rate of transpiration increases with increase in wind velocity.