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a
Iron
b
Manganese
c
Magnesium
d
Molybdenum
answer is C.
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Detailed Solution
Magnesium is a macronutrient because it is needed above a concentration of 10mmole/kg of dry matter in plants. Molybdenum, Manganese and Iron are micronutrients. Micronutrients or trace elements, are needed in very small amounts (less than 10 mmole/Kg of dry matter).