(B) In $1971$,$T$. $O$. Diener discovered a new infectious agent that was smaller than viruses.This agent was named 'viroids'.Viroids consist of a sho

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(B) In $1971$,$T$. $O$. Diener discovered a new infectious agent that was smaller than viruses.This agent was named 'viroids'.Viroids consist of a short strand of low molecular weight $RNA$ and lack a protein coat.They are known to cause the potato spindle tuber disease.