Concept:The diagram shows a mushroom, and the labelled part III indicates the thread-like vegetative structure of the fungus.
Explanation:The body of a mushroom consists of many fine, branching threads.
These threads are called hyphae.
They form a network known as the mycelium, which is the vegetative part of the fungus.
Hyphae contain nuclei and are delicate, unlike roots or rhizoids which are more root-like.
Gills are found under the cap and are used for spore production, not for vegetative structure.
Therefore, the part labelled III is the hyphae.
Answer:C. Hyphae
