Question

Rate of transpiration is reduced with

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

Answer 1

The correct option is A

Decrease in light intensity

The correct option is A.

Explanation of correct option:

1. In the process of transpiration, plants release the water they contain in the form of water vapour or moisture.
2. The transpiration rate measures the distance crossed by an air bubble in a capillary tube over a given time.
3. The affecting elements of transpiration rate are - temperature, light intensity, humidity, air movement.
4. Light has a direct influence on the opening and closing of stomata.
5. The air gets humid when the light intensity decreases, and the rate of transpiration decreases.
6. The transpiration rate decreases with the reduction of light intensity.

Explanation of incorrect options:

Option B:

1. The process of transpiration generally gets faster in high temperature.

Option C:

1. With high water uptake the rate of water absorption through the roots increases which increases the rate of transpiration.

Option D:

1. In windy condition, the rate of transpiration gets high.

Final answer: Rate of transpiration is reduced with decrease in light intensity.