Which of the following organisms are characterized by the absence of chlorophyll in their cells?

Identify the basis of classification of fungi into phycomycetes,ascomycetes,basidiomycetes and deuteromycetes.
$i$. Fruiting bodies
$ii$. Nature of habitat
$iii$. Morphology of mycelium
$iv$. Mode of spore formation

$S:$ Fungi exhibit heterotrophic mode of nutrition.
$R:$ Fungi lack chlorophyll.

Assume that two normal hyphal cells of different fungal mating types unite to form:

The main chemical component of the fungal cell wall is

$A$ specimen of fungus is brought by a student for identification. Upon close examination,he discovered that its hyphae are completely septate and it has gills on the underside of the pileus. To which fungal group does it most likely belong?