NEET Botany Mineral Nutrition Questions Solved

NEET - 2012

Best defined function of manganese in green plants is
(a) photolysis of water
(b) Calvin cycle
(c) nitrogen fixation
(d) water absorption

(a) 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 CI- and Ca+2

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