Decomposer protists are .........

$A$: Nutritional mutant strain of pink mould is auxotroph.
$R$: It is not able to prepare its own metabolites from the raw materials obtained from outside.

In the class Phycomycetes,the mycelium is .........

Dikaryon formation is the characteristic feature of

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.

Which of the following plant bodies is referred to as a mycelium?