Question

Case: Transpiration is the evaporative loss of water by plants. It occurs mainly through the stomata in the leaves. Besides the loss of water vapour in transpiration, exchange of oxygen and carbon dioxide in the leaf also occurs through pores called stomata. Normally stomata remain open during the day and close at night.

Based on the above case answer the following question:

Which of the following will not directly affect the rate of transpiration?

• A. Temperature
• B. Wind speed
• C. Light intensity
• D. Chlorophyll content of leaves

Answer 1

The correct option is D Chlorophyll content of leaves

Environmental factors like light, humidity, temperature, pressure and wind velocity affect the rate of transpiration. The rate of transpiration is directly proportional to the presence of light, high temperature, and high wind velocity while it is inversely proportional to the relative humidity.
The chlorophyll content has no role in the process of transpiration but holds a significance in the process of photosynthesis.