Question:
Which nutrient is classified as a secondary macronutrient?
Which nutrient is classified as a secondary macronutrient?
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Secondary macronutrients: Ca, Mg, S; essential but in moderate amounts.
Updated On: Jul 2, 2026
- Nitrogen
- Phosphorus
- Calcium
- Iron
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The Correct Option is C
Approach Solution - 1
Nutrients are categorized based on the quantity required by plants. Primary macronutrients: Nitrogen (N), Phosphorus (P), Potassium (K). Secondary macronutrients: Calcium (Ca), Magnesium (Mg), Sulfur (S). Micronutrients, like iron, are needed in trace amounts.
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Approach Solution -2
Sort by Category: Nutrients split into three tiers by required quantity — primary macro, secondary macro, and micronutrients. Sort each option into its tier.
Nitrogen and Phosphorus are PRIMARY macronutrients (largest amounts). Iron is a micronutrient (trace amounts). That leaves Calcium, which sits in the secondary macronutrient tier along with Magnesium and Sulfur.
So by elimination and by direct classification, Calcium is the only option matching 'secondary macronutrient.'
Nitrogen and Phosphorus are PRIMARY macronutrients (largest amounts). Iron is a micronutrient (trace amounts). That leaves Calcium, which sits in the secondary macronutrient tier along with Magnesium and Sulfur.
So by elimination and by direct classification, Calcium is the only option matching 'secondary macronutrient.'
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