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Microbiology of Soils

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

Anabaena
Both (a) and (b)
Clostridium
Nostoc

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

nitrate reductase
nitrate oxidase
none of these
nitrogenase

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Microbiology of Soils
Denitrification is carried out

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

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Microbiology of Soils
Which are the main source of biofertilisers?

Cyanobacteria
Streptococcus
None of these
Bacillus

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

nitrogen oxidation
all of these
sulfur oxidation
nitrogen fixation

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Microbiology of Soils
The groups of bacteria which have the ability to fix nitrogen from air to soil are

symbiotic
none of these
nonsymbiotic
both (a) and (b)

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