5. How are viroids different from viruses?
Viroids are different from viruses in following aspects
1. Viroids are smaller in size than viruses.
2. Viruses have both DNA/RNA as a genetic material whereas viroids are free RNA particles.
3. Viroids cause diseases in plants whereas viruses infect both plants and animals.
4. Viruses have a protein coat called capsid whereas viroids lack protein layer.