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Microbiology of Soils

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

Both (a) and (b)
Clostridium
Anabaena
Nostoc

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Microbiology of Soils
Denitrification is carried out

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

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Microbiology of Soils
The diagnostic enzyme for denitrification is

none of these
nitrate reductase
nitrate oxidase
nitro oxidoreductase

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Microbiology of Soils
Which of the following is capable of oxidizing sulfur to sulfates?

Desulfotomaculum
Rhodomicrobium
Thiobacillus thiooxidans
Rhodospirillum

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

nitrogen fixation
all of these
sulfur oxidation
nitrogen oxidation

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

nitrogenase
none of these
nitrate reductase
nitrate oxidase

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