Microbiology of Soils
Some microorganisms have the ability to increase the nitrogen content of soils, are called as

denitrification
nitrogen fixation
all of these
nitrification

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Microbiology of Soils
Syntrophism involves

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

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Microbiology of Soils
Denitrification is

both (a) and (b)
reduction of nitrate to organic nitrogen compounds
changing of atmospheric nitrogen (N2) to nitrogen compounds
reduction of nitrate (NO3-) to nitrogen gas

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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
derive their food and minerals from the legume, and in turn they supply the legume with some or all of its nitrogen
grow together for a mutual benefit is called symbiosis and so these bacteria are called symbiotic nitrogen-fixing bacteria
All of these

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