Question

Instead of having roots and leaves, molds grow as thread-like filaments called _____.

Answer 1

The correct answer is "Hyphae".

In most organisms who have hyphae, the hyphae are the main way of vegetative growth and are collectively called the mycelium. They also occur in yeasts and fungi. 

Answer 2

Answer: The correct answer is -

Hyphae.

Mold can be described as a fungus, which primarily grows in multicellular filaments that is threadlike form, called hyphae.

In most of the fungi, hyphae are considered as the main mode of vegetative growth, and together they are termed as mycelium.

Thus, Hyphae is the right answer.