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Microbiology of Soils

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

denitrification
nitrogen fixation
nitrification
ammonification

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Microbiology of Soils
The physical structure of soil is improved by the accumulation of

mold mycelium
minerals
all of these
water

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

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
Both (a) and (b)

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Microbiology of Soils
In the process of nitrogen fixation, which of the following microorganism is involved?

Symbiotic microorganisms only
None of these
Non symbiotic microorganisms only
Non symbiotic and symbiotic microorganisms only

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

Pectin decomposing bacteria
De-nitrifying bacteria
Nitrifying bacteria
Cyanobacteia

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Microbiology of Soils
The nitrogenase consists of

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

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