Discussion
During photosynthesis, which minerals are required in a splitting reaction ?
Answer: D
Water splitting needs manganese and chlorine.
Photolysis of water takes place at the oxygen-evolving complex of photosystem II, whose catalytic core is a cluster of four manganese ions and one calcium ion. Chloride ions are an essential cofactor of the same complex. Deficiency of either impairs oxygen evolution.
Magnesium is the central atom of chlorophyll but is not part of the water-splitting reaction. Potassium is important for stomatal movement and enzyme activation, not for photolysis. So every option pairing them with the right element is only half correct.
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