Microbiology of Soils
The population of algae in soil is __________ that of either bacteria or fungi.

none of these
generally smaller than
equal to
generally greater than

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Microbiology of Soils
Syntrophism involves

exchange of nutrients between two species
exchange of nutrients among species
no exchange of nutrients between two species
no exchange of nutrients among species

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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
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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Microbiology of Soils
A heterocyst is

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

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