Single correct option
Stomata open when the guard cells
- A. become flaccid by losing water
- B. lose chlorophyll
- C. become turgid by absorbing water
- D. stop photosynthesis
Show answer and solution
Answer: (C) become turgid by absorbing water
When guard cells take in water, they become turgid and their thin outer walls bulge outwards, pulling the inner thick walls apart and opening the pore. Loss of water makes them flaccid, and the stoma closes. Potassium ion uptake in the light drives the movement of water. Stomata allow gas exchange and transpiration.
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