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Microbiology of Soils

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

nitrification
denitrification
ammonification
nitrogen fixation

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

Chlorobium
Both (a) and (b)
Chromaticum
Rhodomicrobium

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Microbiology of Soils
Denitrification may be distinguished as

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

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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
Denitrification is carried out

All of these
usually by facultative anaerobes
predominantly by Pseudomonas spp
predominantly by Bacillus spp

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

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

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