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Microbiology of Soils

Microbiology of Soils
The breakdown of cattle manure in biogas is accomplished by which of the following type of bacteria?

Hydrolytic
methanogenic
All of these
Transitional

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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)
Chlorobium
Chromaticum
Rhodomicrobium

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

Thiobacillus thiooxidans
Rhodospirillum
Rhodomicrobium
Desulfotomaculum

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Microbiology of Soils
Which are the main source of biofertilisers?

Cyanobacteria
Bacillus
Streptococcus
None of these

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Microbiology of Soils
The groups of bacteria which have the ability to fix nitrogen from air to soil are

both (a) and (b)
symbiotic
none of these
nonsymbiotic

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

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

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