If by radiation all nitrogenase enzyme are inactivated, then there will be no

Conversion from ammonium to nitrate in soil

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Conversion from nitrate to nitrite in legumes

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Fixation of atmospheric nitrogen

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Fixation of nitrogen in legumes

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Solution

The correct option is D
Fixation of nitrogen in legumes

If by radiation all nitrogenase enzyme are inactivated, then there will be no nitrogen fixation in legumes.

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