Which one is not a mode of reproduction in Yeast

Options

A. Budding
B. Plasmogamy
C. Oogamy
D. Ascospore formation

Answer

### Step-by-Step Solution:

1. **Identify the Organism**: The question is about yeast, which is a type of fungus. Yeasts are unicellular organisms belonging to the kingdom Fungi.

2. **Understand Modes of Reproduction**: Yeasts can reproduce both sexually and asexually. The common modes of reproduction in yeast include:
- Asexual reproduction through budding.
- Sexual reproduction through processes like plasmogamy.

3. **Evaluate the Given Options**:
- **Budding**: This is a well-known asexual reproduction method in yeast where a new organism develops from an outgrowth or bud of the parent.
- **Plasmogamy**: This is a form of sexual reproduction in yeast where two protoplasts (the living part of the cell) fuse together.
- **Oogamy**: This refers to a type of sexual reproduction that involves the fusion of a large egg cell and a smaller sperm cell, typically seen in higher animals, not in yeast.
- **Eschospore Formation**: This is a method of reproduction where spores are formed, which can occur in yeast.

4. **Determine the Incorrect Option**: Among the options provided:
- Budding, plasmogamy, and eschospore formation are modes of reproduction in yeast.
- Oogamy is not a mode of reproduction in yeast.

5. **Conclusion**: Therefore, the option that is not a mode of reproduction in yeast is **oogamy**.

### Final Answer:
Oogamy is not a mode of reproduction in yeast.

---