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a
Proteins contain nitrogen.
b
It is the most abundant essential mineral element in the plant body
c
Plants can easily absorb nitrogen from the atmosphere.
d
Nitrogen is absorbed by plants in both cationic and anionic form.
answer is C.
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Detailed Solution
Plants cannot directly absorb nitrogen from the atmosphere. They obtain it from the soil in the form of nitrate and ammonium ions. It is one of the major constituents of proteins, nucleic acids, vitamins and hormones.