Viroids are plant pathogens are small RNAs, but these RNAs do not code for any protein products. Viroids are therefore just a site for replication and they steal virtually everything else from the host.VIROIDS DOESNOT CONSIST OF APROTEIN COAT.VIRUSES CONSIST OF A PROTEINCOAT.
Lichen
A lichen is a composite organism consisting of a fungus and a photosynthetic partner growing together in a symbiotic relationship. The photobiont is usually either a green alga or cyanobacterium.Most of the lichen is composed offungalfilaments, but living among the filaments arealgalcells, usually from a green alga or acyanobacterium.A lichen is not a single organism, but the result of a partnership (mutualisticsymbiosis) between afungusand analgaorcyanobacteria.
