Practice question

Vegetative nutrient acquisition in fungi entirely dependent on hyphal network infiltrating substrate and secreting enzymes. Hyphal tips secrete extracellular enzymes that degrade complex polymers like cellulose, lignin, proteins, resulting monomers absorbed through plasma membrane via proton-coupled transporters and facilitated diffusion. Sporangium, basidium, ascus are reproductive structures not involved in absorptive nutrition but spore production. Mycelial architecture maximizes surface-to-volume ratio for osmotrophy, with Spitzenkorper organizing vesicle delivery for tip extension. Therefore hyphae represent primary vegetative absorptive organ, enabling saprotrophic decay, parasitic invasion and mycorrhizal exchange defining ecological roles.