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Stomata open and close due to:

1. circadian rhythm
2. genetic clock
3. pressure of gases inside the leaves
4. turgor pressure of guard cells

Correct answer: turgor pressure of guard cells

Solution

Stomata open when guard cells take up water and become turgid, and close when they lose water and become flaccid. This change in turgor pressure directly bends the guard cells and regulates the pore.

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