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  4. T. O. Diener discovered a new infectious agent that was smaller than viruses and have the following characteristics. (i) It causes potato spindle tuber disease. (ii) It has free RNA. (iii) Molecular weight of RNA is low. Identify the infections agent.

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Q. T. O. Diener discovered a new infectious agent that was smaller than viruses and have the following characteristics.
(i) It causes potato spindle tuber disease.
(ii) It has free RNA.
(iii) Molecular weight of RNA is low.
Identify the infections agent.

Biological Classification

Solution:

Viroids cause potato spindle tuber disease (PSTV), chrysanthemum stunt, citrus exocortis, cucumber pale fruit etc. They cause persistent infections, i.e., never recovered