Botany - Mineral Nutrition Question with Solution | TestHub

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 ${\mathrm{Ca}}^{+2}$.