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Microbiology of Soils

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

ammonia
nitrate
ATP
glucose

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

all of these
nitrification
denitrification
nitrogen fixation

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

Rhodospirillum
Desulfotomaculum
Thiobacillus thiooxidans
Rhodomicrobium

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Microbiology of Soils
The energy value of biogas is typically

400-700 BTU/ft3
1,000 BTU/ft3
more than 5000 BTU/ft3
1500 BTU/ft3

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

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Microbiology of Soils
Most soil protozoa are flagellates or amoebas, having their dominant mode of nitrogen as

ingestion of bacteria
all of these
ingestion of fungi
ingestion of mold

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