Viroids are the smallest known infectious pathogens in the world. It is composed of a short strand of circular, single stranded RNA but protein coat is absent.

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Points to Remember

1. Viroids are subtype of Virus
2. Viroids is much smaller than Virus
3. The genetic material is Single Stranded RNA
4. They lack protein coat(capsid)
5. Example Disease: Potato Spindle Tuber Disease

Related Questions

1. Which of the following disease is caused by viriods
2. Which one of the following pairs is wrongly matched? Ginkgo -Archegonia
3. The smallest known agents of the infectious disease are