Which one is unicellular fungus?

Options

A. Puccinia
B. Toad stool
C. Penicillium
D. Yeast

Answer

To determine which one is a unicellular fungus from the given options, we can follow these steps:

### Step-by-Step Solution:

1. **Understand the Classification of Fungi**:
- Fungi are classified into different groups based on their characteristics. The main groups include Ascomycetes, Basidiomycetes, and others.

2. **Analyze Each Option**:
- **Option 1: Puxenia**: This is a member of the Basidiomycetes group, which is known to be multicellular.
- **Option 2: Toadstool (Agaricus)**: This is also a member of the Basidiomycetes group and is multicellular.
- **Option 3: Penicillium**: This belongs to the Ascomycetes group, which is primarily multicellular but can include some unicellular forms. However, Penicillium is predominantly known as a multicellular fungus.
- **Option 4: Ist (Yeast)**: Yeast is a well-known example of a unicellular fungus.

3. **Identify the Unicellular Fungus**:
- Based on the analysis, the only option that represents a unicellular fungus is **Option 4: Ist (Yeast)**.

4. **Conclusion**:
- Therefore, the correct answer is **Option 4: Ist**, which is a unicellular fungus.