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Standard XII
Biology
Viroids
Question

Which of the following statements is wrong for viroids?
  1. They lack a protein coat
  2. They are smaller than viruses
  3. They cause infections
  4. Their RNA is of high molecular weight

A
Their RNA is of high molecular weight
B
They lack a protein coat
C
They are smaller than viruses
D
They cause infections
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Solution
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Viroids are infectious, nonprotein‐coding, highly structured small circular low-molecular-weight ribonucleic acids (RNAs) able to replicate autonomously and induce diseases in higher plants.
Viroids are single-stranded covalently closed circular RNA molecules existing as highly base-paired rod-like structures.
So.option D is correct.

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