The name of the class is based on sexual structure as the site karyogamy and meiosis in

Options

A. Phycomycetes and Actinomycetes
B. Deuteromycetes and Zygomycetes
C. Acomycetes and Basidiomycetes
D. Basidiomycetes and Actinomycetes

Answer

To solve the question regarding the name of the class based on the sexual structure as the site of karyogamy and meiosis, we can follow these steps:

### Step-by-Step Solution:

1. **Understand the Terms**:
- Karyogamy refers to the fusion of two nuclei.
- Meiosis is the process that reduces the chromosome number by half, resulting in the formation of spores.

2. **Identify the Sexual Structures**:
- In fungi, the sexual structures are crucial for reproduction. The two main classes of fungi that we will consider are Ascomycetes and Basidiomycetes.
- Ascomycetes have a structure called Ascus, which contains the sexual spores known as ascospores.
- Basidiomycetes have a structure called Basidium, which produces basidiospores.

3. **Link the Structures to the Classes**:
- The name "Ascomycetes" is derived from the presence of the Ascus, while "Basidiomycetes" comes from the Basidium.
- Both structures are involved in karyogamy and meiosis, making them significant in the sexual reproduction of these fungi.

4. **Determine the Correct Answer**:
- Since the question asks for the class name based on the sexual structure where karyogamy and meiosis occur, the correct answer would be "Ascomycetes" and "Basidiomycetes."
- However, if we need to choose one, we can conclude that both classes are correct, but if only one option is provided, it would depend on the context of the question.

5. **Final Conclusion**:
- The answer to the question is that the classes Ascomycetes and Basidiomycetes are named based on their respective sexual structures (Ascus and Basidium) that serve as the sites for karyogamy and meiosis.