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  4. Potato Spindle Tuber disease is caused by a

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Q. Potato Spindle Tuber disease is caused by a

NTA AbhyasNTA Abhyas 2020

Solution:

The Potato spindle tuber disease is caused by viroid called as Potato spindle tuber viroid (PSTVd). It is an important pathogen of potato and tomato. Viroid is an infectious agent which is smaller than viruses. They contain very low molecular weight ss RNA and lack a protein coat.