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


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The gift of wisdom rightfully discriminates against foolery. T.F. Hodge, From Within I Rise: Spiritual Triumph Over Death and Conscious Encounters with quot The Divine Presence