Abscisic acid (ABA) is an antitranspirant. It | vedclass

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(B) Abscisic acid $(ABA)$ acts as a stress hormone that promotes the closure of stomata during water stress conditions.It functions by inhibiting the

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Preventing $K^+$ ion uptake,thus decreasing the osmotic concentration of the guard cells and keeping them flaccid

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(B) Abscisic acid $(ABA)$ acts as a stress hormone that promotes the closure of stomata during water stress conditions.It functions by inhibiting the active uptake of $K^+$ ions into the guard cells.As the concentration of $K^+$ ions decreases,the osmotic potential of the guard cells increases (solute concentration decreases),leading to the efflux of water from the guard cells into the surrounding subsidiary cells.This loss of water causes the guard cells to become flaccid,resulting in the closure of the stomatal pore,thereby reducing transpiration.

Abscisic acid $(ABA)$ is an antitranspirant. It prevents transpiration by:

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