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Microbiology of Soils

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

Anabaena
Nostoc
Clostridium
Both (a) and (b)

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Microbiology of Soils
The microbial ecosystem of soil includes

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

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

ammonification
nitrogen fixation
nitrification
denitrification

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Microbiology of Soils
In the process of nitrogen fixation, which of the following microorganism is involved?

Non symbiotic and symbiotic microorganisms only
None of these
Non symbiotic microorganisms only
Symbiotic microorganisms only

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

Rhodomicrobium
Desulfotomaculum
Thiobacillus thiooxidans
Rhodospirillum

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Microbiology of Soils
Bacteria, as a group, are responsible for

sulfur oxidation
all of these
nitrogen fixation
nitrogen oxidation

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