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Which one of the following is essential for photolysis of water?
A
Copper
B
Boron
C
Manganese
D
Zinc
Detailed Solution
Photolysis (splitting) of water is associated with photosystem II, on the inner side of the thylakoid membrane: $2H_2O \rightarrow 4H^+ + O_2 + 4e^-$
The electrons released replace those removed from PS II; oxygen is evolved as a by-product.
The oxygen-evolving complex contains manganese; manganese (with chloride ions) is needed for the splitting of water to liberate oxygen during photosynthesis.
Copper is a component of plastocyanin, boron is needed for pollen germination and membrane function, and zinc activates carboxylases and is needed for auxin synthesis.
Hence manganese is essential for photolysis of water.
The electrons released replace those removed from PS II; oxygen is evolved as a by-product.
The oxygen-evolving complex contains manganese; manganese (with chloride ions) is needed for the splitting of water to liberate oxygen during photosynthesis.
Copper is a component of plastocyanin, boron is needed for pollen germination and membrane function, and zinc activates carboxylases and is needed for auxin synthesis.
Hence manganese is essential for photolysis of water.