(A) In $1971$,$T$.$O$. Diener discovered a new infectious agent that was smaller than viruses and caused potato spindle tuber disease. This agent was

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(A) In $1971$,$T$.$O$. Diener discovered a new infectious agent that was smaller than viruses and caused potato spindle tuber disease. This agent was found to be a free infectious $RNA$ molecule that lacked the protein coat typically found in viruses. This infectious agent was named a 'viroid'.