Not a characteristic of rusts:
Correct answer: C. Ustilago is the most common smut
- A. Rusty disease spots on leaves and stem
- B. Brick red spores
- C. Ustilago is the most common smut
- D. All these
Explanation
The correct answer is Option C: Ustilago is the most common smut. Rusts and smuts are both types of fungi but have distinct differences. Rusts are known for causing rusty spots on plants and producing red or orange spores, whereas Ustilago refers to a genus of smut fungi, which are different from rusts. Options A and B describe true characteristics of rust fungi, making them incorrect choices. Option D is incorrect because not all the listed options are characteristics of rust fungi.
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Fungi are mainly multicellular, non-photosynthetic organisms with chitinous cell walls that obtain nutrients by extracellular digestion and absorption. Coverage includes hyphae, mycelium, spores, yeast, moulds, mushrooms, decomposer and parasitic roles, and the differences between fungi, plants and bacteria.
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