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

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

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Microbiology of Soils
A heterocyst is

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

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Microbiology of Soils
The groups of symbiotic bacteria, which have the ability to fix 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
derive their food and minerals from the legume, and in turn they supply the legume with some or all of its nitrogen
All of these

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