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B
Mg
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C
Mn
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D
Zn
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Solution
The correct option is B Mg
The essential elements which are required by the plants in comparatively large amounts are called as major elements or macronutrients. They are C, H, O, N, P, K, Ca, S, Mg. Micronutrients which are required in relatively fewer amounts are Fe, Mn, Zn, B, Cu, Ni, CI, and Mo. These are the cofactors of enzymes and helps in the enzymatic activity of the plant.