Question

A sudden increase in carbon dioxide concentration around a leaf will cause:

• A. Wider opening of stomata
• B. Increase in transpiration
• C. Closure of stomata
• D. Decrease in transpiration due to closure of stomata

Answer 1

The correct option is D Decrease in transpiration due to closure of stomata

Stomata are tiny pores present on the surface of the leaves. They allow the exchange of gases between plants and atmosphere. They allow carbon dioxide to enter and oxygen to exit. There are three environmental factors that affect opening and closing of a plant stomata. These are light, water and carbon dioxide. A sudden increase in carbon dioxide concentration around a leaf will cause closure of stomata so that excess carbon dioxide does not enter the cell. This will decrease in rate of transpiration.

Thus, the correct answer is option D.