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Microbiology of Soils

Microbiology of Soils
Denitrification may be distinguished as

assimilative
blue baby syndrome
both (a) and (b)
dissimilative

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

De-nitrifying bacteria
Cyanobacteia
Pectin decomposing bacteria
Nitrifying bacteria

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Microbiology of Soils
Some microorganisms have the ability to increase the nitrogen content of soils, are called as

nitrogen fixation
denitrification
all of these
nitrification

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Microbiology of Soils
Which of the following soil microorganism is involved in the reduction of sulfates to H2S?

Thiobacillus thiooxidans
Desulfotomaculum
Rhodomicrobium
Rhodospirillum

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Microbiology of Soils
The diagnostic enzyme for denitrification is

nitrate oxidase
nitro oxidoreductase
none of these
nitrate reductase

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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
Both (a) and (b)
It also contains with traces of H2S, N2, H2and CO

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