Microbiology of Soils
Some microorganisms have the ability to increase the nitrogen content of soils, are called as

nitrogen fixation
nitrification
all of these
denitrification

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Microbiology of Soils
Nitrogen fixation

both (a) and (b)
fix the free nitrogen (N2) by which it should not be usable by plants
changes the free nitrogen (N2) to a form usable by plants
especially changes nitrogen compounds, mostly amines such as NH2

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Microbiology of Soils
Nitrogen fixation by the microorganisms can be detected by adopting the approach of

All of these
measuring15N2 by mass spectrometer
demonstrating growth in a nitrogen free medium
cultivating the microorganisms in the presence of nitrogen labeled with isotropic nitrogen

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