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Microbiology of Soils

Microbiology of Soils
Denitrification may be distinguished as

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

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Microbiology of Soils
Nitrifying bacteria can not be isolated directly by the usual techniques employed to isolate hetrotrophic bacteria. The reasons may be due to

medium growth
fast growth
slow growth
none of these

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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
In the process of nitrogen fixation, which of the following microorganism is involved?

None of these
Non symbiotic microorganisms only
Symbiotic microorganisms only
Non symbiotic and symbiotic microorganisms only

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

Cyanobacteia
Pectin decomposing bacteria
Nitrifying bacteria
De-nitrifying bacteria

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

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

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