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Microbiology of Soils

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

ammonification
nitrogen fixation
denitrification
nitrification

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

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

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Microbiology of Soils
Denitrification is carried out

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

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

nitrogen fixation
all of these
nitrogen oxidation
sulfur oxidation

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Microbiology of Soils
Most soil protozoa are flagellates or amoebas, having their dominant mode of nitrogen as

all of these
ingestion of bacteria
ingestion of fungi
ingestion of mold

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

Clostridium
Both (a) and (b)
Anabaena
Nostoc

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