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

Nitrifying bacteria
Pectin decomposing bacteria
De-nitrifying bacteria
Cyanobacteia

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Microbiology of Soils
Syntrophism involves

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

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

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

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