Which group includes molds, rusts, mildews, smuts, mushrooms, and yeasts?

• A. Fungus
• B. Bacteria
• C. Algae
• D. Protozoa

Answer: (A)

Molds, rusts, mildews, smuts, mushrooms, and yeasts all belong to the fungal kingdom. They share key features: they are eukaryotic and obtain nutrients by absorbing them from their surroundings (not by photosynthesis), their cell walls contain chitin, and they reproduce mainly through spores, which explains how widespread and varied they are—from single-celled yeasts to complex mushroom fruiting bodies and plant-damaging rusts and smuts. In contrast, bacteria are prokaryotes with no nucleus, algae are typically photosynthetic and often aquatic, and protozoa are single-celled eukaryotes with diverse modes of nutrition. Because the listed organisms fit these fungal characteristics, they are classified as fungi.