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Copper : Electron transfer (Cu+ ⇌ Cu2+). Maintenance of carbohydrate / nitrogen balance, chlorophyll synthesis. Iron : Electron transport in photosynthesis and respirations (Fe2+ ⇌ Fe3+), development of chloroplasts, chlorophyll and other pigments, protein synthesis. Manganese : Metabolism and photolytic evolution of oxygen.

1. Copper
2. Iron
3. Manganese
4. All of these

Correct answer: All of these

Solution

Copper, iron, and manganese are all essential micronutrients with the functions listed. Since each statement is correct for its respective element, the inclusive option is correct.

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