Microbiology of Soils
Syntrophism involves

exchange of nutrients between two species
exchange of nutrients among 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

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

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Microbiology of Soils
The groups of symbiotic bacteria, which have the ability to fix nitrogen

All of these
derive their food and minerals from the legume, and in turn they supply the legume with some or all of its nitrogen
these bacteria are from the genus, Rhizobium
grow together for a mutual benefit is called symbiosis and so these bacteria are called symbiotic nitrogen-fixing bacteria

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