Select the wrong statement.

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(C) : Viroids are infectious $RNA$ particles which were discovered by $T$.$O$. Diener $(1971)$.These are devoid of protein coat and cause diseases in

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The viroids were discovered by $D$.$J$. Ivanowsky.

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(C) : Viroids are infectious $RNA$ particles which were discovered by $T$.$O$. Diener $(1971)$.These are devoid of protein coat and cause diseases in plants only,e.g.,potato spindle tuber,chrysanthemum stunt etc.Therefore,the statement that viroids were discovered by $D$.$J$. Ivanowsky is incorrect,as $D$.$J$. Ivanowsky discovered the causal organism of tobacco mosaic disease.

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