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Which of these is a macronutrient?

AManganese
BMagnesium ion
CPotassium
DMolybdenum
Answer & Solution
Correct answer: C. Potassium
1. Macronutrients are present in large amounts. 2. The list runs from carbon through to magnesium. 3. Potassium is on the macronutrient list. _Source: syllabus Biology, Ch 12 'Mineral Nutrition'_
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