Microbiology of Soils
Nitrifying bacteria can not be isolated directly by the usual techniques employed to isolate hetrotrophic bacteria. The reasons may be due to

slow growth
medium growth
none of these
fast growth

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Microbiology of Soils
Nitrogen oxidation (nitrification)refers to the

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

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Microbiology of Soils
Syntrophism involves

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

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