Which option is correct for the subunits of a viral capsid?

Which nucleic acid is present in the structure of a viroid in a stranded form?

$A$ : Viroids are not included in the five-kingdom system.
$R$ : They are non-cellular.

Which of the following is $NOT$ true for lichens?

$T. O.$ Diener discovered a new infectious agent that was smaller than viruses and has the following characteristics:
$(i)$ It causes potato spindle tuber disease.
$(ii)$ It has free $RNA$.
$(iii)$ The molecular weight of $RNA$ is low.
Identify the infectious agent.

Enzymes are absent in