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

grow together for a mutual benefit is called symbiosis and so these bacteria are called symbiotic nitrogen-fixing bacteria
these bacteria are from the genus, Rhizobium
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

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Microbiology of Soils
Denitrification is

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

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Microbiology of Soils
A heterocyst is

a cell that carries out oxygenic photosynthesis
a terminally differentiated cell that fixes nitrogen
the progenitor of cyanobacterial vegetative cells
a type of spore

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