Abscisic acid causes the stomata to close during stress by
Enhancing drooping of leaves
Inducing synthesis of carotenoids
Inhibiting an ATP dependent proton pump
Abscission of leaves
Transpiration: During desiccation and other stresses, abscisic acid is rapidly synthesised. The inhibitor causes closure of stomata and hence prevents transpiration.
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Abscisic acid causes the stomata to close during stress by inhibiting an ATP dependent proton pump