Question

Non-septate mycelium occurs in
A. Phycomycetes
B. Ascomycetes
C. Basidiomycetes
D. Deuteromycetes

Answer 1

Hint: There is a various thread-like structure on the fungi which help them to grab nutrients. The various classes of fungi have different types of hyphae. Some are uninucleated while some are multinucleated. They are the non-reproductive part of the plant.

Complete answer:
What is mycelium? The vegetative part of the fungus or fungi- bacteria-like creature, which has a thread like hyphae is mycelium. They develop from the spore which cannot reproduce but when two mycelia join, they give mushroom-like fruiting bodies. They help them to obtain nutrients from the environment.
Septate mycelium is the mycelium with one septum dividing the hyphae into various uninucleate or multinucleated cells.
Non-septate mycelium is the one in which the nucleus divides while the cytoplasm remains the same. It is like one big cell with many nuclei. These are kind of primitive hyphae.
Let us see to which family does it belong.
> Option A: Phycomycetes: They are the lower fungi group having aseptate coenocytic hyphae.
> Option B: Ascomycetes: They are the higher fungi under the eumycota group having septate mycelium.
> Option C: Basidiomycetes: These are also the higher fungi with septate mycelium under the eumycota group.
> Option D: Deuteromycetes: Having the septate mycelium is their defining feature.

So the answer is option A: Phycomycetes.

Note:
Hyphae cluster forms the mycelium. They are long tube-like filamentous structures. Septate forms the walls of the cellular components. The one which lacks this wall is non-septate. They can control the opening and closing of the septa depending on the conditions to reduce the fluid loss from their body.