Question

Some hyphae are continuous tubes filled with multinucleated cytoplasm. These are called

Answer 1

Coenocytic hyphae

In certain fungi (like the members of class Phycomycetes), the hyphae do not possess cross walls or septa (aseptate).

As a result, the nuclei lie in a continuous protoplasm and such hyphae are called coenocytic.

Final answer
(d) Coenocytic hyphae