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(C) The ultimate source of nitrogen is the atmosphere.It is fixed into usable forms by several biological and non-biological processes.Plants primaril

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$I$ and $II$

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(C) The ultimate source of nitrogen is the atmosphere.It is fixed into usable forms by several biological and non-biological processes.Plants primarily absorb nitrogen from the soil in the form of nitrates $(NO_3^-)$ and ammonium salts $(NH_4^+)$.Therefore,nitrogen is present in the soil in the form of nitrates and ammonium salts.

Nitrogen is present in the soil in the form of
$I.$ Nitrates $II.$ Ammonium salts
$III.$ Nitrite $IV.$ None of these

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Nitrogen is present in the soil in the form of$I.$ Nitrates $II.$ Ammonium salts$III.$ Nitrite $IV.$ None of these