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Which one of the following is not a micronutrient?

1. Molybdenum
2. Magnesium
3. Zinc
4. Boron

Correct answer: Magnesium

Solution

Magnesium is a macronutrient, not a micronutrient, because plants need it in relatively larger amounts. Molybdenum, zinc, and boron are all micronutrients required in trace quantities.

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