Stomata opens in the presence of

Options :
  1. Magnesium ions
  2. Sodium ions
  3. Potassium ions
  4. iodide ions
Answer and Explanation :-

Answer: Option 3

Explanation:

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He hesitated, remembering something Finnikin had said to him on their journey. That somehow, even in the worst of times, the tiniest fragments of good survive. It was the grip in which one held those fragments that counted.
-Melina Marchetta Finnikin of the Rock