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(B) Abscisic acid $(ABA)$ is a plant growth inhibitor that plays a crucial role in the closure of stomata during water stress conditions.When a plant

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Abscisic acid

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(B) Abscisic acid $(ABA)$ is a plant growth inhibitor that plays a crucial role in the closure of stomata during water stress conditions.When a plant experiences water stress,$ABA$ is synthesized in the leaves,which triggers the efflux of potassium ions $(K^+)$ from the guard cells.This loss of ions leads to a decrease in the turgor pressure of the guard cells,causing them to become flaccid and resulting in the closure of the stomatal pore.Therefore,$ABA$ acts as a stress hormone to prevent water loss through transpiration.

Several plant growth regulators affect the opening of stomata. The closure of stomata is induced by ...........

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