mediumFPSCNTSCSSPPSCEveryday Science
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Correct Answer: C: Sulphur
Explanation: The correct answer is C: Sulphur. Sulphur is a secondary plant nutrient. Primary macronutrients are Nitrogen, Phosphorus, and Potassium, while secondary nutrients are Calcium, Magnesium, and Sulphur — needed in smaller quantities.