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Microbiology of Soils

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

nitrogen fixation
nitrification
denitrification
ammonification

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

Chromaticum
Chlorobium
Both (a) and (b)
Rhodomicrobium

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Microbiology of Soils
The microbial ecosystem of soil includes

abiotic components of soil
None of these
biotic and abiotic components of soil
biotic components of soil

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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
Denitrification may be distinguished as

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

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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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