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Microbiology of Soils

Microbiology of Soils
Denitrification may be distinguished as

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

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

Rhodospirillum
Thiobacillus thiooxidans
Desulfotomaculum
Rhodomicrobium

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

denitrification
all of these
nitrogen fixation
nitrification

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

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

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

De-nitrifying bacteria
Cyanobacteia
Nitrifying bacteria
Pectin decomposing bacteria

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

Clostridium
Anabaena
Nostoc
Both (a) and (b)

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