Mycelium is a feature of

Step 1: Analyze the question The question asks which group of organisms has a mycelium as a feature.

Step 2: Explain the concept A mycelium is a mass of thread-like filaments called hyphae. It forms the vegetative body of most fungi. The hyphae grow through a food source such as soil, bread, or rotting wood. They secrete enzymes and absorb the digested nutrients.

Examples of fungi with a mycelium include Mucor and Rhizopus (bread molds), Penicillium, and Aspergillus. Mushrooms also have a mycelium, which grows underground or inside the substrate. The mushroom we see is only the fruiting body.

Step 3: Check each option

• A. Algae: These are simple photosynthetic organisms. They may be unicellular, colonial, or filamentous, like Spirogyra, but they do not have a mycelium.
• B. Bacteria: These are prokaryotic single cells. They do not form true hyphae or a mycelium. A few filamentous types such as actinomycetes look similar, but they are not the standard answer here.
• C. Ferns: These are vascular plants with roots, rhizomes, and fronds. They have no mycelium.
• D. Fungi: Yes. Their body is made of hyphae that together form a mycelium.
• E. Viruses: These are non-cellular particles and have no such structure.

Step 4: Answer The correct answer is D. fungi.

Tip: Link the words "Mycelium → Mycology → Fungi." Myco- means fungus. If you see "hyphae" or "mycelium" in an exam, think fungi.