(B) The covered smut of Sorghum is a seed-borne disease caused by the fungus $Sphacelotheca$ $sorghi$. This pathogen infects the ovaries of the host p

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(B) The covered smut of Sorghum is a seed-borne disease caused by the fungus $Sphacelotheca$ $sorghi$. This pathogen infects the ovaries of the host plant,replacing the grain with a mass of dark spores enclosed within a persistent membrane,which is why it is referred to as 'covered' smut.