Botany - Mineral Nutrition Question with Solution | TestHub

Photolysis of water requires light energy, and oxygen evolving complex (OEC) and an electron carrier $Y_z$. 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 ${\mathrm{Ca}}^{2+}$.