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

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

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Microbiology of Soils
A heterocyst is

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

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