Conversion of free nitrogen into it's compounds is called .

nitrogen fixation

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nitrification

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assimilation

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Solution

The correct option is A nitrogen fixation
Nitrogen fixation include the conversion of free nitrogen in the air into it's compounds.
Rhizobium bacteria present in the roots of leguminous plants absorb atmospheric nitrogen and convert it into nitrogen compounds.

Suggest Corrections

Microorganism	Role in nitrogen cycle
(i)	Conversion of nitrate to free nitrogen
Nitrosococcus	(ii)
Nitrocystis	(iii)
(iv)	Conversion of free nitrogen to nitrogen compounds