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Microbiology of Soils

Microbiology of Soils
An example of a symbiotic nitrogen fixer is

Rhizobium
Beijerinckia
Clostridium
Azotobacter

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

Rhodospirillum
Desulfotomaculum
Rhodomicrobium
Thiobacillus thiooxidans

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Microbiology of Soils
The phenomenon of commensalism refers to a relationship between organisms in which

both the species of a pair benefit
one species of a pair benefits
one species of a pair is more benefited
None of these

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Microbiology of Soils
Degree of compost maturity can be assesed by

None of these
infrared technique
germination test
both (a) and (b)

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

Chromaticum
Both (a) and (b)
Rhodomicrobium
Chlorobium

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Microbiology of Soils
The diagnostic enzyme for denitrification is

nitro oxidoreductase
nitrate reductase
nitrate oxidase
none of these

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