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

medium growth
slow growth
none of these
fast growth

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Microbiology of Soils
Denitrification is

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

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