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The oxygen evolved during photosynthesis comes from water molecules. Which one of the following pairs of elements is involved in this reaction?

1. Manganese and Potassium
2. Magnesium and Molybdenum
3. Magnesium and Chlorine
4. Manganese and Chlorine

Correct answer: Manganese and Chlorine

Solution

The oxygen released in photosynthesis comes from the splitting of water at the oxygen-evolving complex of photosystem II. This complex requires manganese and chloride as essential components for efficient water oxidation.

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