Which of the following organisms possesses a cell wall?

Mycology $(Mycetology)$ is a branch which deals with the study of

$Statement-1$: Yeast is a multicellular fungus.
$Statement-2$: Penicillium is a unicellular fungus.
$Statement-3$: Albugo is a parasitic fungus on mustard.

Which fungus is a parasite on mustard?

Thread-like filaments of fungi are known as:

Plant diseases caused by $Ustilago$ are called smuts because ......