When oxygen is deficient in the atmosphere

Options :
  1. stomata start closing up
  2. stomata open fully
  3. stomata close up provided temperature is high
  4. none of these
Answer and Explanation :-

Answer: Option 1

Explanation:

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To fear death is nothing other than to think oneself wise when one is not for it is to think one knows what one does not know. No man knows whether death may not even turn out to be the greatest blessing for a human being and yet people fear it as if they knew for certain that is is the greatest of evil." (Socrates in The Apology)
-Plato