Correct Answer: Iron
Subject: geography
Explanation: Iron is a Micronutrient, whereas Nitrogen, Phosphorus, and Calcium are Macronutrients. • Macronutrients (required in larger amounts) include N, P, K, Sulfur (S), Calcium (Ca), and Magnesium (Mg). • Micronutrients include Chlorine, Iron, Boron, Manganese, Zinc, Copper, and Molybdenum. • A, B, and D belong to the same category (Macronutrients). • 'NPK' (Nitrogen, Phosphorus, Potassium) are the primary macronutrients found in standard agricultural fertilizers. • Soil is the major natural source for these essential elements determining crop yield. • ट्रिक: लोहा (Iron) एक सूक्ष्म पोषक तत्व (Micronutrient) है, बाकी तीन — N, P, Ca — वृहत पोषक तत्व (Macronutrients) हैं।
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