The infectious agents made up of $RNA$ only are

Dahlia mosaic virus has which of the following as its genetic material?

Which disease in tobacco was identified by $D.J. Ivanowsky$ as being caused by viruses?

Choose the correct option for the following statements:
$(i)$ The name virus,meaning venom or poisonous fluid,was given by $Pasteur / D. J. Ivanowsky$.
$(ii)$ $W. M. Stanley / T. O. Diener$ discovered viroids.

Which is the correct option for the given figures?

Symbiotic association between fungi and algae are called $ . . . . . . $.