Microbiology of Soils
Which of the following species of different genera of bacteria are not capable of transforming nitrate to nitrogen?

Alcaligenes
Agrobacterium
None of these
Achromobacter

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Microbiology of Soils
Nitrogen fixation by the microorganisms can be detected by adopting the approach of

All of these
demonstrating growth in a nitrogen free medium
measuring15N2 by mass spectrometer
cultivating the microorganisms in the presence of nitrogen labeled with isotropic nitrogen

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Microbiology of Soils
Syntrophism involves

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

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