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

VA Mycorrhiza
Saccharomyces cerevisiae
Aspergillus niger
Candida torulopsis

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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
measuring15N2 by mass spectrometer
demonstrating growth in a nitrogen free medium
All of these

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