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B
Ethylene
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C
Cyto kinin
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D
Abscisic acid
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Solution
The correct option is D Abscisic acid
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.