Differentiate between viruses and viroids.

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 Viruses      Viroids
 1. They have high molecular weight.  They have low molecular weight.
 2. They are larger in size.  They are smaller in size.
 3. They can infect plant, animals and bacteria.  They mainly infect plants.
 4. The genetic material can be ssRNA, ds-RNA or DNA.  The genetic material is single stranded circular RNA.
 5. Protein coat is present.  Protein coat is absent.
 6. mosaic disease is a plant disease caused by viruses. Tomato chloric dwarf is a plant disease caused by viroids.

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