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Microbiology of Soils

Microbiology of Soils
Assimilative denitrification is done by

all of these
plants
fungi
prokaryotes

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Microbiology of Soils
__________ play a key role in the transformation of rock to soil.

Cyanobacteia
Pectin decomposing bacteria
Nitrifying bacteria
De-nitrifying bacteria

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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
The nonsymbiotic bacteria which fix nitrogen live in the soil independently are

Azotobacter
Clostridium
All of these
considerably less important in comparison to the symbiotic bacteria

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

ammonification
nitrogen fixation
denitrification
nitrification

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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

none of these
fast growth
medium growth
slow growth

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