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Microbiology of Soils

Microbiology of Soils
The conversion of molecular nitrogen into ammonia is known as

denitrification
nitrification
nitrogen fixation
ammonification

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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

fast growth
slow growth
none of these
medium growth

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Microbiology of Soils
The organisms responsible for the characteristic musty or earth odor of a freshly plowed field is/are

Streptomyces
Micromonospora
all of these
Nocardia

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Microbiology of Soils
Most soil protozoa are flagellates or amoebas, having their dominant mode of nitrogen as

all of these
ingestion of bacteria
ingestion of mold
ingestion of fungi

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Microbiology of Soils
The nitrogenase consists of

both (a) and (b)
none of these
dinitrogenase
dinitrogenase reductase

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Microbiology of Soils
Which of the following statement is not true about composition of biogas?

It also contains with traces of O2 and Cl2
It also contains with traces of H2S, N2, H2and CO
Both (a) and (b)
It is composed almost exclusively of methane and carbon dioxide

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