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(A) The $ABA$ (Abscisic Acid) theory is considered the most recent explanation for the mechanism of stomatal closure,proposed by Cowan et al. in $1982

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$ABA$ theory

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(A) The $ABA$ (Abscisic Acid) theory is considered the most recent explanation for the mechanism of stomatal closure,proposed by Cowan et al. in $1982$.According to this theory,the synthesis of abscisic acid during water stress (drought) or mid-day conditions promotes the reversal of the $H^+ \rightleftharpoons K^+$ pump.This leads to an increase in the concentration of $H^+$ ions within the guard cell cytoplasm,causing the efflux of $K^+$ ions and water,which results in the closure of the stomata.The active $K^+$ transport theory,which explains the opening and closing of stomata,was initially proposed by Imamura $(1943)$ and Fujino $(1967)$,while the Proton $(H^+-K^+)$ transport theory was proposed by Levitt $(1974)$.

Which of the following theories provides the latest explanation for the closure of stomata?

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