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  4. A disease caused by a viroid is:

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Q. A disease caused by a viroid is:

NTA AbhyasNTA Abhyas 2020Biological Classification

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.