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

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Microbiology of Soils
Nitrogen fixation

changes the free nitrogen (N2) to a form usable by plants
both (a) and (b)
especially changes nitrogen compounds, mostly amines such as NH2
fix the free nitrogen (N2) by which it should not be usable by plants

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Microbiology of Soils
A heterocyst is

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

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