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Which one of the following is essential for photolysis of water?

(a) zinc Your answer
(b) manganese Correct
(c) copper Your answer
(d) boron Your answer

Your answer: Correct answer: (b)

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Explanation

Why (b) is correct

The water-splitting complex of PS II contains manganese (with calcium and chloride). It splits water into protons, electrons and oxygen.

Why the other options are wrong

(a) · your answer Zinc is needed for some enzymes and auxin synthesis, not for splitting water.
(c) · your answer Copper is part of plastocyanin, an electron carrier, but it does not split water.
(d) · your answer Boron is needed for pollen germination and cell differentiation, not photolysis.

NCERT point: The water-splitting complex is on the inner (lumen) side of the thylakoid membrane, linked with PS II.

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