Q.

Which of the following is a beneficial element ?a. Sib. Nac. Co

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a

a only

b

b only

c

c only

d

a, b and c

answer is D.

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Detailed Solution

There are some beneficial elements such as sodium, silicon, cobalt and selenium. They are required by higher plants.
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Which of the following is a beneficial element ?a. Sib. Nac. Co