Final answer:
Viroids are small, circular RNA particles that are plant pathogens. They reproduce within a host cell and do not manufacture proteins. Their presence can impact the agriculture industry.
Step-by-step explanation:
Viroids are small, single-stranded, circular RNA particles that are plant pathogens. They are simpler than viruses and do not have a capsid or outer envelope. Viroids reproduce only within a host cell and do not manufacture any proteins. They produce a single, specific RNA molecule, and their presence can have a severe impact on the agriculture industry.