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Microbiology of Soils

Microbiology of Soils
Denitrification may be distinguished as

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

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

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

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Microbiology of Soils
__________ play a key role in the transformation of rock to soil.

Pectin decomposing bacteria
Nitrifying bacteria
Cyanobacteia
De-nitrifying bacteria

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Microbiology of Soils
Which are the main source of biofertilisers?

Streptococcus
None of these
Cyanobacteria
Bacillus

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

nitrogenase
nitrate oxidase
nitrate reductase
none of these

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Microbiology of Soils
Some microorganisms have the ability to increase the nitrogen content of soils, are called as

nitrogen fixation
nitrification
all of these
denitrification

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