A) Is a radioactive and can be traced by Geiger counter
B) Is required in very minute amounts
C) Draws other element out of protoplasm
D) Was one of the first to be discovered in protoplasm
Correct Answer: B
Solution :
They are those essential elements which are required by plants in traces only, equal or less than 0.1 mg/gm of dry matter. They are eight in number - Fe, Zn, Mn, B, Cu, Mo, Cl and Ni.
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