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Microbiology of Soils

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

nitrate
ATP
ammonia
glucose

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Microbiology of Soils
Which of the following statement is not true about composition of biogas?

It also contains with traces of H2S, N2, H2and CO
It also contains with traces of O2 and Cl2
Both (a) and (b)
It is composed almost exclusively of methane and carbon dioxide

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Microbiology of Soils
The nitrogenase consists of

dinitrogenase reductase
both (a) and (b)
dinitrogenase
none 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
Agrobacterium
Alcaligenes
Achromobacter

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

Desulfotomaculum
Rhodomicrobium
Thiobacillus thiooxidans
Rhodospirillum

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Microbiology of Soils
The population of algae in soil is __________ that of either bacteria or fungi.

generally smaller than
equal to
none of these
generally greater than

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