The sex orange are absent, but plasmogamy is brought about by fusion of two vegetative or somatic cells of different genotypes. It is the feature of

Options

A. Phycomycetes
B. Basidiomycetes
C. Ascomycetes
D. All of these

Answer

To solve the question regarding the absence of sex organs and the occurrence of plasmogamy through the fusion of vegetative or somatic cells of different genotypes, we can follow these steps:

### Step-by-Step Solution:

1. **Understanding the Terms**:
- **Plasmogamy**: This is the fusion of the cytoplasm of two parent cells. In fungi, this can occur without the fusion of nuclei (karyogamy).
- **Vegetative or Somatic Cells**: These are non-reproductive cells that make up the body of the organism.

2. **Analyzing the Options**:
- **Phycomycetes**: This group includes fungi like Rhizopus and Mucor. They typically have specialized sex organs (gametangia) for reproduction, so they do not fit the criteria of the question.
- **Basidiomycetes**: This group includes mushrooms and other fungi. They can undergo plasmogamy through the fusion of two different genotypes without the presence of specialized sex organs. This aligns with the description in the question.
- **Ascomycetes**: Known as sac fungi, this group includes yeast and Penicillium. They typically have sex organs and do not fit the criteria of the question.

3. **Conclusion**:
- Since Phycomycetes and Ascomycetes both have sex organs, they cannot be the answer. Basidiomycetes, on the other hand, can undergo plasmogamy through the fusion of vegetative cells without sex organs, making it the correct answer.

### Final Answer:
The feature described in the question is characteristic of **Basidiomycetes**.

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