Lewitt's explanation for stomatal action is d | vedclass

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(B) Lewitt proposed the $pH$ theory for stomatal movement. According to this theory,the opening and closing of stomata are regulated by changes in the

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Variations in $pH$ value

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(B) Lewitt proposed the $pH$ theory for stomatal movement. According to this theory,the opening and closing of stomata are regulated by changes in the $pH$ of the guard cells. During the day,photosynthesis reduces the $CO_2$ concentration,leading to an increase in $pH$ (alkaline condition). This high $pH$ promotes the conversion of starch into soluble sugars,which lowers the water potential of guard cells,causing water to enter via osmosis,resulting in stomatal opening. Conversely,at night,$CO_2$ accumulates,lowering the $pH$ (acidic condition),which triggers the conversion of sugar back into starch,leading to stomatal closure.

Lewitt's explanation for stomatal action is due to

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