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Microbiology of Soils

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

denitrification
nitrogen fixation
nitrification
ammonification

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

Chlorobium
Chromaticum
Both (a) and (b)
Rhodomicrobium

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

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

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Microbiology of Soils
The diagnostic enzyme for nitrogen-fixing organisms is

nitrate oxidase
nitrogenase
nitrate reductase
none of these

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Microbiology of Soils
Which of the following is not the biofertilisers producing bacteria?

Anabaena
Both (a) and (b)
Nostoc
Clostridium

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Microbiology of Soils
Denitrification may be distinguished as

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

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