A) trace element
B) non-essential
C) macro nutrient
D) none of these
Correct Answer: A
Solution :
Zn, Mo, Fe, Cu are required by plants in very low amount, so there are called trace elements or microelements. Non-essential elements are not required for metabolic activity of plants, Macro elements are required by plants in high amount, e.g., C, H, N, etc.
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