Best defined function of manganese in green plants is
Best defined function of manganese in green plants is
photolysis of water
Calvin cycle
nitrogen fixation
water absorption
Solution
Photolysis of water requires light energy, an Oxygen Evolving Complex (OEC) and electron carrier 1/2. OEC complex was formerly called Z-enzyme. It has four Mn ions. Light energy brings about changes in $\mathrm{Mn}\left(\mathrm{Mn}^{+2}, \mathrm{Mn}^{3+}, \mathrm{Mn}^{+4}\right)$ which helps in removing electrons from $\mathrm{OH}^{-}$component of water forming oxygen. Liberation of oxygen also requires $\mathrm{Cl}^{-}$and $\mathrm{Ca}^{+2}$.