A) Molybdenum
B) Magnesium
C) Zinc
D) Boron
Correct Answer: B
Solution :
The essential elements, which are required by plants in comparatively large amounts are called as macro elements, eg, C, H, O, N, P, K, Ca, S, Mg, Fe. The elements, which are required in very small amount by the plants are called micro elements, eg, Zn, Mn, B, Cu, Mo and Cl.
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