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

none of these
fast growth
slow growth
medium growth

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Microbiology of Soils
Syntrophism involves

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

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Microbiology of Soils
Denitrification is

both (a) and (b)
reduction of nitrate (NO3-) to nitrogen gas
changing of atmospheric nitrogen (N2) to nitrogen compounds
reduction of nitrate to organic nitrogen compounds

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