Stomata open and close due to

Options :
  1. circadian rhythm
  2. genetic clock
  3. pressure of gases inside the leaves
  4. turgor pressure of guard cells
Answer and Explanation :-

Answer: Option 4

Explanation:

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You can never know everything. Part of what you know is always wrong. Perhaps the most important part. A portion of wisdom lies in knowing that. A portion of knowledge lies in going on anyway.
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