In which class of fungi, asexual spores are produced exogenously, while sexual spores are produced endogenously?

Options

A. Deuteromycetes
B. Ascomycetes
C. Phycomycetes
D. Basidiomycets

Answer

To solve the question regarding the class of fungi where asexual spores are produced exogenously and sexual spores are produced endogenously, we can follow these steps:

### Step-by-Step Solution:

1. **Understand the Question**: The question asks for a class of fungi that produces asexual spores externally (exogenously) and sexual spores internally (endogenously).

2. **Review the Options**: The options provided typically include:
- Deuteromycetes
- Ascomycetes
- Phycomycetes
- Basidiomycetes

3. **Analyze Deuteromycetes**:
- Known as imperfect fungi, they primarily reproduce asexually.
- They do not have a known sexual reproduction stage.
- **Conclusion**: This class does not fit the criteria since it lacks sexual spores.

4. **Analyze Ascomycetes**:
- Known as sac fungi.
- Asexual spores (conidia) are produced exogenously.
- Sexual spores (ascospores) are produced endogenously in a sac-like structure called an ascus.
- **Conclusion**: This class fits the criteria perfectly.

5. **Analyze Phycomycetes**:
- Known for producing asexual spores (zygospores or aplanospores).
- Both types of spores are produced endogenously.
- **Conclusion**: This class does not fit the criteria as it lacks exogenous asexual spores.

6. **Analyze Basidiomycetes**:
- Typically do not produce asexual spores.
- Sexual spores (basidiospores) are produced externally.
- **Conclusion**: This class does not fit the criteria as it lacks asexual spores.

7. **Final Conclusion**: After analyzing all options, the only class that meets the requirement of producing asexual spores exogenously and sexual spores endogenously is **Ascomycetes**.

### Answer: Ascomycetes (Option 2)

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