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Answer: 2. manganese

Key idea: Manganese (Mn) is needed for the water-splitting (photolysis) step of the light reaction, which releases \(\mathrm{O_2}\), protons and electrons.

Chlorine is also needed for this step. Magnesium is a macronutrient (part of chlorophyll), copper is needed in plastocyanin, and molybdenum is needed for nitrogen metabolism (nitrate reductase).

Doubtly AI · 30 Oct 2026 AI-generated · not yet verified Report
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