Q. The metal/non-metal ion involved in opening and closing of stomata is
Solution:
The mechanism of opening and closing of stomata is explained by active $K ^{+}$ion transport theory which was put forward by Levitt (1974). Given flowchart show the mechanism of stomatal opening : Guard cells maintain their electroneutrality by balancing $K \cdot$ with malate and $Cl ^{-}$, During night or dark: $CO _{2}$ cone, increases in sub-stomatal cavities $\rightarrow$ ABA participation $\rightarrow K^{+}$ions exchange stopped $\rightarrow K^{+}$ ions transported back into subsidiary cells $\rightarrow$ Decreased $pH \rightarrow$ Starch synthesized in guard cells $\rightarrow$ Decreased O.P. of guard cells $\rightarrow$ Exosmosis from guard cell $\rightarrow$ Stomata close.
