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

generally greater than
equal to
none of these
generally smaller than

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Microbiology of Soils
Syntrophism involves

exchange of nutrients among species
exchange of nutrients between two species
no exchange of nutrients among species
no exchange of nutrients between two species

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Microbiology of Soils
Nitrogen fixation by the microorganisms can be detected by adopting the approach of

cultivating the microorganisms in the presence of nitrogen labeled with isotropic nitrogen
All of these
measuring15N2 by mass spectrometer
demonstrating growth in a nitrogen free medium

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