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Microbiology of Soils

Microbiology of Soils
The nitrogenase consists of

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

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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

slow growth
fast growth
medium growth
none of these

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Microbiology of Soils
Assimilative denitrification is done by

fungi
prokaryotes
all of these
plants

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

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

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Microbiology of Soils
For rapid decomposition by microbes, the substrate should have a C/N ratio of

10-20
30-40
20-30
60-80

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

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

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