Viroid
1. It is an infectious RNA particle
2. Viroid is formed of only RNA
3. A protein coat is absent
4. Viroid has a smaller size 5. Viroid infects only plants
Virus
1. It is a nuclearprotein particle
2. Nucleic can be DNA or RNA
3. A protien covering a coat called always present
4. Virus has a larger size
5. Virus infects all types of organism