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Microbiology of Soils

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

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

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Microbiology of Soils
For rapid decomposition by microbes, the substrate should have a C/N ratio of

30-40
60-80
10-20
20-30

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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
Denitrification is carried out

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

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Microbiology of Soils
Denitrification may be distinguished as

assimilative
dissimilative
both (a) and (b)
blue baby syndrome

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

nitrogenase
none of these
nitrate oxidase
nitrate reductase

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