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

All of these
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
derive their food and minerals from the legume, and in turn they supply the legume with some or all of its nitrogen

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Microbiology of Soils
Syntrophism involves

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

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