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B
Four
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C
Three
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D
Two
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Solution
The correct option is A Five Puccinia graminis is macrocyclic, producing all five spore stages: basidiospores, pycniospores (spermatia), aeciospores, urediniospores (uredospores), and teliospores. Although stem rust is caused by a single species of fungus, Puccinia graminis, there is considerable genetic variation within the species.