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


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That what I need to survive is not Gale's fire, kindled with rage and hatred. I have plenty of fire myself. What I need is the dandelion in the spring. The bright yellow that means rebirth instead of destruction. The promise that life can go on, no matter how bad our losses. That it can be good again. And only Peeta can give me that.
-Suzanne Collins Mockingjay