For phycomycetes class of fungus, incorrect statement is

Options

A. their mycelium is aseptate and coenocytic
B. the fusion of gametes results in the formation of zygospore.
C. modes of asexual reproduction are motile aplanospores and non-motile zoospores
D. Parasitic fungus Albugo produces white sports on mustard leaves.

Answer

To determine the incorrect statement regarding the phycomycetes class of fungi, we will analyze each statement provided.

### Step-by-step Solution:

1. **Understanding Mycelium Structure**:
- The first statement claims that the mycelium of phycomycetes is aseptate and syncytial.
- Aseptate means that there are no septa (divisions) present in the mycelium, allowing for a continuous cytoplasm with multiple nuclei.
- Syncytial indicates that the mycelium consists of a multinucleate structure.
- **Conclusion**: This statement is **correct**.

2. **Fusion of Gametes**:
- The second statement mentions that the fusion of gametes results in the formation of a zygospore.
- In phycomycetes, the fusion of gametes does indeed lead to the formation of a zygospore, which is a characteristic feature of this group.
- **Conclusion**: This statement is **correct**.

3. **Mode of Asexual Reproduction**:
- The third statement discusses the mode of asexual reproduction, stating that it involves motile aplanospores and non-motile zoospores.
- However, aplanospores are actually non-motile, while zoospores are motile.
- Therefore, this statement incorrectly describes the reproductive structures.
- **Conclusion**: This statement is **incorrect**.

4. **Parasitic Fungus**:
- The fourth statement refers to the parasitic fungus Albugo, which causes white spots on mustard leaves.
- This is a true statement, as Albugo is indeed a well-known parasitic fungus affecting mustard plants.
- **Conclusion**: This statement is **correct**.

### Final Answer:
The incorrect statement regarding the phycomycetes class of fungi is the one about the mode of asexual reproduction, which incorrectly identifies aplanospores as motile and zoospores as non-motile.

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