In which of the following pair the occurrence of dikaryophase of fungus can be observed ?

Options

A. Ascomycetes and Basidiomycetes
B. Phycomycetes and Ascomycetes
C. Phycomycetes and Basidiomycetes
D. Basidiomycetes and Deuteromycetes

Answer

To determine the occurrence of the dikaryophase in fungi, we need to analyze the different groups of fungi mentioned in the options:

1. **Understand Dikaryophase**: The dikaryophase is a stage in the life cycle of certain fungi where two genetically distinct nuclei coexist in the same cell. This occurs after plasmogamy (fusion of cytoplasm) and before karyogamy (fusion of nuclei).

2. **Identify the Fungal Groups**:
- **Ascomycetes**: This group is known to have a dikaryophase. In Ascomycetes, karyogamy is delayed and occurs just before meiosis.
- **Basidiomycetes**: Similar to Ascomycetes, Basidiomycetes also exhibit a dikaryophase. Here too, karyogamy is delayed, leading to the presence of dikaryotic cells.
- **Phycomycetes**: This group does not have a dikaryophase. In Phycomycetes, karyogamy occurs immediately after plasmogamy.
- **Deuteromycetes**: This group, also known as imperfect fungi, does not have a known dikaryophase as they do not have a sexual reproduction phase.

3. **Evaluate the Options**:
- **Option 1: Ascomycetes and Basidiomycetes** - Both groups exhibit dikaryophase.
- **Option 2: Phycomycetes and Ascomycetes** - Phycomycetes do not have a dikaryophase.
- **Option 3: Phycomycetes and Basidiomycetes** - Phycomycetes do not have a dikaryophase.
- **Option 4: Basidiomycetes and Deuteromycetes** - Deuteromycetes do not have a dikaryophase.

4. **Conclusion**: The only pair that exhibits the dikaryophase is Ascomycetes and Basidiomycetes.

Therefore, the correct answer is **Ascomycetes and Basidiomycetes**.