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Microbiology of Soils

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

ammonification
nitrification
nitrogen fixation
denitrification

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Microbiology of Soils
The energy value of biogas is typically

1500 BTU/ft3
more than 5000 BTU/ft3
1,000 BTU/ft3
400-700 BTU/ft3

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Microbiology of Soils
Which of the following microorganism use H2S as the electron donor to reduce carbon dioxide?

Both (a) and (b)
Chromaticum
Rhodomicrobium
Chlorobium

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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 H2S, N2, H2and CO
It also contains with traces of O2 and Cl2
Both (a) and (b)

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

Rhodospirillum
Thiobacillus thiooxidans
Rhodomicrobium
Desulfotomaculum

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Microbiology of Soils
Nitrogen fixation refers to the direct conversion of atmospheric nitrogen gas into

nitrate
ammonia
glucose
ATP

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