Question:medium
Which nutrient is classified as a secondary macronutrient?
Which nutrient is classified as a secondary macronutrient?
Show Hint
Secondary macronutrients: Ca, Mg, S; essential but in moderate amounts.
Updated On: Jul 2, 2026
- Nitrogen
- Phosphorus
- Calcium
- Iron
Show Solution
The Correct Option is C
Solution and Explanation
Key Concept: Plant nutrients are grouped into three tiers by how much of each a plant needs.
Why it's correct: Calcium belongs to the secondary macronutrient group, alongside Magnesium and Sulfur — needed in moderate (not trace) amounts.
Why others fail: Nitrogen and Phosphorus are PRIMARY macronutrients (largest quantities), while Iron is a micronutrient needed only in trace amounts — both different tiers from Calcium.
Why it's correct: Calcium belongs to the secondary macronutrient group, alongside Magnesium and Sulfur — needed in moderate (not trace) amounts.
Why others fail: Nitrogen and Phosphorus are PRIMARY macronutrients (largest quantities), while Iron is a micronutrient needed only in trace amounts — both different tiers from Calcium.
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