Microbiology of Soils
__________ play a key role in the transformation of rock to soil.

Cyanobacteia
Pectin decomposing bacteria
De-nitrifying bacteria
Nitrifying bacteria

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Microbiology of Soils
A heterocyst is

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

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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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