Microbiology of Soils
The nonsymbiotic bacteria which fix nitrogen live in the soil independently are

considerably less important in comparison to the symbiotic bacteria
Azotobacter
Clostridium
All of these

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Microbiology of Soils
A heterocyst is

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

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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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