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

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
All of these

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Microbiology of Soils
Syntrophism involves

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

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Microbiology of Soils
Denitrification is

changing of atmospheric nitrogen (N2) to nitrogen compounds
reduction of nitrate (NO3-) to nitrogen gas
both (a) and (b)
reduction of nitrate to organic nitrogen compounds

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