(A) Potato spindle tuber disease is caused by $Viroids$. $Viroids$ are infectious agents that consist of a short strand of circular,single-stranded $R

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(A) Potato spindle tuber disease is caused by $Viroids$. $Viroids$ are infectious agents that consist of a short strand of circular,single-stranded $RNA$ without a protein coat. They were discovered by $T.O. Diener$ in $1971$. Unlike viruses,they lack a capsid and are much smaller in size.