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Microbiology of Soils

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

nitrification
denitrification
ammonification
nitrogen fixation

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Microbiology of Soils
The transformation of nitrates to gaseous nitrogen is accomplished by microorganisms in a series of biochemical reactions. The process is known as

nitrogen fixation
ammonification
denitrification
nitrification

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

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

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

Nitrifying bacteria
Cyanobacteia
De-nitrifying bacteria
Pectin decomposing bacteria

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Microbiology of Soils
The crops which are involved in nitrogen fixation are

alfalfa and clover
all of these
soybean
bean and lupine

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Microbiology of Soils
Denitrification is carried out

usually by facultative anaerobes
predominantly by Pseudomonas spp
predominantly by Bacillus spp
All of these

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