Depending on the requirements, plant nutrients are classified as micro

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Depending on the requirements, plant nutrients are classified as micronutrients and macronutrients. Which one of the following is an example of a macronutrient?

Manganese
Copper
Magnesium
Chlorine
This question was previously asked in
UPSC CAPF – 2022
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The correct answer is C) Magnesium.
Plant nutrients are classified as macronutrients or micronutrients based on the quantity required by the plant. Macronutrients are needed in relatively large amounts, while micronutrients are needed in very small amounts. The primary macronutrients are Nitrogen (N), Phosphorus (P), and Potassium (K). Secondary macronutrients include Calcium (Ca), Magnesium (Mg), and Sulfur (S). Manganese (Mn), Copper (Cu), and Chlorine (Cl) are classified as micronutrients.
Magnesium is a component of chlorophyll, essential for photosynthesis, and activates many enzymes. Its requirement by plants is relatively high compared to micronutrients.

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