Its turgor pressure decreases. Its atmospheric pressure decreases. Its rate of transpiration increases. Its rate of photosynthesis increases.
I gave my students this multiple choice question: Which statement best explains what happens to a leaf when it has lost much-needed water?

Only one answer is correct among these 4 choices:
- Its turgor pressure decreases.
- Its atmospheric pressure decreases.
- Its rate of transpiration increases.
- Its rate of photosynthesis increases.

Could you tell me which one is correct?

Its turgor pressure decreases.