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Microbiology of Soils

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

glucose
ammonia
ATP
nitrate

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Microbiology of Soils
__________ play a key role in the transformation of rock to soil.

Pectin decomposing bacteria
Nitrifying bacteria
De-nitrifying bacteria
Cyanobacteia

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

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

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Microbiology of Soils
The nitrogenase consists of

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

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Microbiology of Soils
The energy value of biogas is typically

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

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

none of these
equal to
generally smaller than
generally greater than

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