Q. A disease caused by a viroid is:

 1706  219 NTA AbhyasNTA Abhyas 2020Biological Classification Report Error

Solution:

Viroids are small, circular RNA molecules that do not encode any protein and that are infectious as naked RNA molecules. Viroids are often transmitted through vegetative propagation of plants, but can also be transmitted during agricultural or horticultural practices in which contaminated instruments are used. It is known to cause potato spindle tuber disease.