Botany - Transport in Plants Question with Solution | TestHub

During the opening of stomata, malic acid dissociates into malate ion and${\mathrm{H}}^{+}$ions. An energy-dependent proton pump starts and transports${\mathrm{H}}^{+}$ions out of guard cells and${\mathrm{K}}^{+}$ions enter inside. The K⁺ions combine with malate ion to form potassium malate and thus increase the OP of guard cells. As a result, endosmosis occurs and stomata open.