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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She belongs to the winter that is past, to the darkness that is over, and has no part or lot in the life I shall lead for the next six months. Oh, I could dance and sing for joy that the spring is here! What a ressurection of beauty there is in my garden, and of brightest hope in my heart.
-Elizabeth von Arnim Elizabeth and Her German Garden