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
A heterocyst is

a cell that carries out oxygenic photosynthesis
the progenitor of cyanobacterial vegetative cells
a type of spore
a terminally differentiated cell that fixes nitrogen

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Microbiology of Soils
Syntrophism involves

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

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