All plant viruses (except cauliflower mosaic virus) contain

Solution(By Examveda Team)

All plant viruses (except cauliflower mosaic virus) contain RNA.
Plant viruses are obligate intracellular parasites that do not have the molecular machinery to replicate without a host. The great majority have an RNA genome, which is usually small and single stranded (ss), but some viruses have double-stranded (ds) RNA, ssDNA or dsDNA genomes.
Cauliflower mosaic virus (CaMV) is a member of the genus Caulimovirus, one of the six genera in the family Caulimoviridae, which are pararetroviruses that infect plants. The viral particles contain DNA instead of RNA.