Question

The rate of transpiration directly depends on

• A. Temperature
• B. Negative turgor pressure
• C. Diffusion pressure dificit
• D. Vapour pressure gradient

Answer 1

The correct option is D Vapour pressure gradient

Transpiration is the loss of water in form of water vapour from the stomata. Most important factor responsible for transpiration is vapour pressure gradient. This is because water vapour molecules will move from a region of their high concentration to a region of their low concentration. Usually concentration of water vapour molecules is less in the atmosphere as compared to the internal environment of leaf. This gradient is important for transpiration process.

So, the correct answer is option D.