Microbiology of Soils
In the process of nitrogen fixation, which of the following microorganism is involved?

None of these
Symbiotic microorganisms only
Non symbiotic and symbiotic microorganisms only
Non symbiotic microorganisms only

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Microbiology of Soils
Nitrogen fixation

both (a) and (b)
especially changes nitrogen compounds, mostly amines such as NH2
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

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