Question
Write a short note on viroids.
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Answer
- These are mainly plant pathogens.
- Viroids were discovered by Theodor Diener.
- The first viroid discovered was PSTV (Potato spindle tuber viroid) which causes a disease in potato.
- Viroids are very small, circular, single stranded RNA which are without any protein coat.
- Viroids are smaller in size than viruses.
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