Powdery mildew of wheat is caused by species of

Which pair of the following belongs to $Basidiomycetes$?

Assertion $(A)$: In bread mold $(Rhizopus)$,sexual reproduction does not result in the formation of an embryo.
Reason $(R)$: In sponges $(Porifera)$,the cell wall is made of cellulose.

When moist bread is kept exposed in air,it becomes mouldy and black because:

The main component of the cell wall of most fungi is ...........

The "dolipore septum" is a characteristic feature of .......