The causative agent of ergotism, a disease affecting rye and other cereals, is:

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Ergotism is caused by the fungus Claviceps purpurea, which infects the ovaries of rye and other grasses, replacing the seeds with hard, dark sclerotia (ergots). These sclerotia contain potent alkaloids (like ergotamine) that cause severe vasoconstriction and neurological symptoms in humans and animals consuming contaminated grain. Ustilago causes smut, and Puccinia causes rust.

The causative agent of ergotism, a disease affecting rye and other cereals, is: MCQ with Answer and Explanation

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