Who recognized certain microbes as the causative organisms of the mosaic disease of tobacco?

Which of the following is an example of an animal virus?

Choose the correct option regarding the components of a lichen:
In lichens,the algal component is called the . . . . . . .

$T$.$O$. Diener discovered . . . . . . .

Assertion $A$: Lichens are symbiotic associations between algal and fungal components. Reason $R$: The mycobiont components of fungi are heterotrophic. Which option is correct for Assertion $A$ and Reason $R$?

Who discovered $TMV$ (Tobacco Mosaic Virus)?