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Microbiology of Soils

Microbiology of Soils
An example of a symbiotic nitrogen fixer is

Beijerinckia
Clostridium
Azotobacter
Rhizobium

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

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

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

Desulfotomaculum
Rhodospirillum
Thiobacillus thiooxidans
Rhodomicrobium

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Microbiology of Soils
The diagnostic enzyme for denitrification is

nitro oxidoreductase
none of these
nitrate oxidase
nitrate reductase

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

Both (a) and (b)
Clostridium
Nostoc
Anabaena

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

nitrogen fixation
ammonification
nitrification
denitrification

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