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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?

Transitional
methanogenic
All of these
Hydrolytic

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

Thiobacillus thiooxidans
Rhodomicrobium
Rhodospirillum
Desulfotomaculum

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

nitrogen fixation
nitrification
denitrification
all of these

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

Chromaticum
Rhodomicrobium
Both (a) and (b)
Chlorobium

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Microbiology of Soils
The nonsymbiotic bacteria which fix nitrogen live in the soil independently are

All of these
Azotobacter
Clostridium
considerably less important in comparison to the symbiotic bacteria

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Microbiology of Soils
An example of a symbiotic nitrogen fixer is

Clostridium
Azotobacter
Rhizobium
Beijerinckia

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