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Microbiology of Soils

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

Both (a) and (b)
Anabaena
Clostridium
Nostoc

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Microbiology of Soils
Which of the following soil microorganism is involved in the reduction of sulfates to H2S?

Rhodomicrobium
Rhodospirillum
Desulfotomaculum
Thiobacillus thiooxidans

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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
10-20
60-80

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Microbiology of Soils
The microbial ecosystem of soil includes

biotic components of soil
None of these
abiotic components of soil
biotic and abiotic components of soil

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

nitrogen oxidation
sulfur oxidation
all of these
nitrogen fixation

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Microbiology of Soils
Nitrogen fixation refers to the direct conversion of atmospheric nitrogen gas into

ammonia
ATP
glucose
nitrate

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