(D) The correct answer is $D$. Loose smut of wheat is caused by the fungus $Ustilago$ $tritici$. This disease is internally seed-borne, where the path

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(D) The correct answer is $D$. Loose smut of wheat is caused by the fungus $Ustilago$ $tritici$. This disease is internally seed-borne, where the pathogen infects the developing ovary of the flower, remains dormant in the seed, and manifests when the infected seed is planted in the next season.