Ownclasses

Best defined function of manganese in green plants is

  • Photolysis of water

  • Calvin cycle

  • Nitrogen fixation

  • Water absorption

Answer

A.

Photolysis of water

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 Mn (Mn+2,  Mn3+,  Mn+4) which helps in removing electrons from OH- component of water forming oxygen. Liberation of oxygen also requires Cl- and Ca+2.

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 Mn (Mn+2,  Mn3+,  Mn+4) which helps in removing electrons from OH- component of water forming oxygen. Liberation of oxygen also requires Cl- and Ca+2.