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Question

Hormone which helps in the closing of stomata is
  1. Auxin
  2. Ethylene
  3. Cyto kinin
  4. Abscisic acid

A
Abscisic acid
B
Auxin
C
Ethylene
D
Cyto kinin
Solution
Verified by Toppr

  • Abscisic acid (ABA) is an important growth regulator which helps in the closure of stomata in a case when the plants are water-stressed and the roots are deficient in water. \
  • The stressed condition acts as an alarm to release the ABA from roots that travel to the leaf through vascular systems.
  • This ABA regulates sodium and potassium intake and it leads to the loss of turgidity of the guard cell.
So, the correct answer is option D.

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