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Microbiology of Soils

Microbiology of Soils
The nitrogenase consists of

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

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

Desulfotomaculum
Thiobacillus thiooxidans
Rhodomicrobium
Rhodospirillum

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Microbiology of Soils
The physical structure of soil is improved by the accumulation of

mold mycelium
water
minerals
all of these

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Microbiology of Soils
The breakdown of cattle manure in biogas is accomplished by which of the following type of bacteria?

Hydrolytic
Transitional
methanogenic
All of these

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Microbiology of Soils
Which of the following species of different genera of bacteria are not capable of transforming nitrate to nitrogen?

None of these
Achromobacter
Alcaligenes
Agrobacterium

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

glucose
ATP
nitrate
ammonia

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