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

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

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