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

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

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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.
changing of atmospheric nitrogen (N2) to nitrogen compounds
sulfur is oxidized to the sulfate form through Thiobacillus bacteria
None of these

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

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

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