Microbiology of Soils
Which of the following fungi on infecting crop roots can improve their uptake of phosphorus and other nutrients?

Saccharomyces cerevisiae
Candida torulopsis
VA Mycorrhiza
Aspergillus niger

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

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

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Microbiology of Soils
Syntrophism involves

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

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