(B) Viroids are infectious agents that are smaller than viruses. They consist of a short strand of circular,single-stranded $RNA$ without a protein co

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(B) Viroids are infectious agents that are smaller than viruses. They consist of a short strand of circular,single-stranded $RNA$ without a protein coat (capsid). They were discovered by $T.O. Diener$ in $1971$ and are known to cause diseases in plants,such as potato spindle tuber disease.