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Microbiology of Soils

Microbiology of Soils
The diagnostic enzyme for denitrification is

nitro oxidoreductase
none of these
nitrate reductase
nitrate oxidase

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Microbiology of Soils
The nitrogenase consists of

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

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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
The groups of bacteria which have the ability to fix nitrogen from air to soil are

none of these
nonsymbiotic
symbiotic
both (a) and (b)

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Microbiology of Soils
The energy value of biogas is typically

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

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

nitrate
ammonia
glucose
ATP

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