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Best defined function of Manganese in green plants is:

1. (a) Photolysis of water
2. (b) Calvin cycle
3. (c) Nitrogen fixation
4. (d) Water absorption

Correct answer: (a) Photolysis of water

Solution

Manganese is essential in the oxygen-evolving complex of photosystem II, where it catalyzes photolysis of water during the light reactions. This releases electrons, protons, and oxygen, making it the best-defined function among the options.

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