Question

Due to low atmospheric pressure, the rate of transpiration will be

• A. Decrease slowly
• B. Decrease fast
• C. Increase
• D. Remain unaffected

Hint:

Lower atmospheric pressure enhances diffusion, thereby increasing the rate of transpiration.

Answer 1

The Correct Option is C

Step 1: Transpiration is the loss of water vapour from the aerial parts of plants, mainly through stomata.
Step 2: At low atmospheric pressure, the diffusion of water vapour from the leaf surface to the surrounding air becomes faster.
Step 3: Faster diffusion of water vapour increases the rate of transpiration. Hence, due to low atmospheric pressure, the rate of transpiration increases.