Microbiology of Soils
The nonsymbiotic bacteria which fix nitrogen live in the soil independently are

All of these
Azotobacter
considerably less important in comparison to the symbiotic bacteria
Clostridium

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

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Microbiology of Soils
Syntrophism involves

no exchange of nutrients between two species
no exchange of nutrients among species
exchange of nutrients among species
exchange of nutrients between two species

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