Question

What is absent in viroids?

Answer 1

Viroids:

1. Infectious pathogens that affect plants are known as viroids.
2. Viroids generally affect higher plants.
3. Viroids were discovered by T.O. Diener in 1971.
4. Viroids have circular strands of RNA without any protein coating.
5. The size of viroids is smaller than the viruses.
6. Viroids lack a protein coat.
7. Example: Avocado sunblotch viroid, Chrysanthemum stunt viroid, etc.

Thus, protein coat is absent in viroids.