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B
S
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C
B
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D
K
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Solution
The correct option is A Zn
A protoplasmic element is an element which produces protoplasmic constituents like proteins, nucleic acids, chlorophyll, cytochromes, ferredoxin etc. Zinc is also a protoplasmic element. It is required everywhere in the plants. It activates various enzymes, especially carboxylase, and mainly required in the synthesis of auxin.