During the light-dependent reactions of photosynthesis in green plants, photolysis of water molecules occurs at the photosystem II complex. Which specific metallic micronutrient acts as an essential cofactor facilitating this water-splitting enzyme reaction?

💡 Solution & Explanation

The oxygen-evolving complex of photosystem II contains a manganese-calcium cluster that catalyzes the oxidation of water to molecular oxygen, releasing protons and electrons. Magnesium forms the central core of the chlorophyll porphyrin ring. Micronutrients are vital enzyme cofactors in plant physiology.