UPSC 2015 CDS I GK Paper

Among the given options, manganese is a micronutrient present in soil for various crops. And Calcium, Magnesium and Potassium are the macronutrients.
Macronutrients: ‘Macro’ indicateslarge and ‘macronutrients’ are the nutrients required in large amounts. For example, C, H, N, O, P, K, Cs, Mg,S.
Micronutrients: ‘Micro’ indicates small and ‘micronutrients’ are the nutrients required in small amounts. For example, Fe, Mn, Cu,Zn, Mo, B, Cl, Ni.