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Microbiology of Soils

Microbiology of Soils
The nitrogenase consists of

both (a) and (b)
dinitrogenase reductase
none of these
dinitrogenase

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

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

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

nitrogen fixation
denitrification
all of these
nitrification

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Microbiology of Soils
The phenomenon of commensalism refers to a relationship between organisms in which

one species of a pair benefits
None of these
one species of a pair is more benefited
both the species of a pair benefit

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

Rhodospirillum
Rhodomicrobium
Thiobacillus thiooxidans
Desulfotomaculum

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

Rhodospirillum
Rhodomicrobium
Thiobacillus thiooxidans
Desulfotomaculum

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