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Answer 1

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Viroids were discovered in 1917 by T.O. Denier. They cause potato spindle tuber disease. They are smaller in size than viruses. They also lack the protein coat and contain free RNA of low molecular weight.

Answer 2

Answer:-

◆ Viroids are free RNA molecules of low molecular weight without any protein coat while viruses can have eitheir RNA or DNA molecule encapsulated in a protein coat.

◆ Viroids are smaller in size than viruses.Viroids infect only plants whereas virus infects all types of organisms.