Which fly lives on fungi?

• A. Filter
• B. Fungus gnat
• C. House fly
• D. Fruit

Answer: (B)

Flies that rely on fungi have life stages tied to fungal growth. The larvae of fungus gnats feed on fungi in moist soils, compost, or around mushroom beds, where fungal hyphae and fruiting bodies provide their main food source. This close association with fungal material is what defines them and makes them the one that lives on fungi.

In contrast, house flies develop in decaying organic matter like manure and kitchen waste, not fungi as their primary habitat. Fruit flies are attracted to fermenting fruit and yeasts rather than living on fungi. So, the fungus gnat is the best fit because its very life cycle centers on fungi.