Which one of the following is not a microelement for plants?

Options

A. Cu
B. B
C. Zn
D. Cr

Answer

D

Explanation

Plants require many organic and inorganic nutrients to complete their life-cycle. It has been established that some elements are required by plants in relatively large amount and are called major elements or macronutrients, e.g., `C, H, O, N, S, P, K, Ca and Mg`.
Microelements or minor elements or trace elements are required by plants in very small amount, less than 1ppm. E.g., `Fe, Cu, B, Zn, Mn, Mo, Cl.` Thus Cr is not a microelement.