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

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

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Microbiology of Soils
Nitrogen oxidation (nitrification)refers to the

conversion of ammonium ions into nitrates through the activities of certain bacteria.
sulfur is oxidized to the sulfate form through Thiobacillus bacteria
changing of atmospheric nitrogen (N2) to nitrogen compounds
None of these

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