What is the primary role of mycelium in fungi?

Mycelium plays a crucial role in fungi primarily through nutrient absorption. It consists of a network of thread-like structures called hyphae, which spread out in the soil or other substrates. This extensive network increases the surface area for the absorption of water and nutrients, allowing the fungus to take up essential substances such as carbohydrates, nitrogen, and minerals.

In addition to facilitating nutrient uptake, mycelium helps decompose organic matter, breaking down complex substances into simpler forms that can be absorbed. This process is vital for nutrient recycling within ecosystems, making mycelium indispensable for the growth and survival of fungi.

Other options, while related to fungi, do not accurately capture the primary function of mycelium. Reproduction occurs through fruiting bodies rather than mycelium itself; movement is not a characteristic of fungi; and defense mechanisms are typically not the primary role of mycelium. Thus, the primary role of mycelium is indeed nutrient absorption.