Botany - Transport in Plants Question with Solution | TestHub

According to active${\mathrm{K}}^{+}$theory of Levitt, opening of stomata occurs due to influx of${\mathrm{K}}^{+}$into guard cells. The source of${\mathrm{K}}^{+}$ions are nearby subsidiary and epidermal cells. The stomatal closure is considered to be brought about by exertion of${\mathrm{K}}^{+}\mathrm{a}\mathrm{n}\mathrm{d}\mathrm{ }\mathrm{C}{\mathrm{l}}^{-}$from the guard cells to epidermal tissue.