Which of the following diseases is caused by the Tobacco Mosaic Virus $(TMV)$?

The Tobacco Mosaic Virus $(TMV)$ is a tubular filament of size:

$A$: Lichens do not grow in polluted areas having $SO_2$.
$R$: Lichens secrete carbonic acid and oxalic acid on barren rocks.

Asexual reproduction in lichens occurs through which of the following? $(i)$ Pycniospores $(ii)$ Zoospores $(iii)$ Aplanospores $(iv)$ Soredia $(v)$ Apothecia

From which plants did $D.J. Ivanowsky$ discover viruses?

Which of the following statements is incorrect about viruses?