The imperfect fungi which are decomposers of litter and help in mineral cycling belong to:

Options

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

Answer

To solve the question regarding the imperfect fungi that act as decomposers of litter and assist in mineral cycling, we can follow these steps:

### Step-by-Step Solution:

1. **Understanding Imperfect Fungi**:
- Imperfect fungi are characterized by the absence of a sexual reproductive stage in their life cycle. This means they reproduce asexually through spores or other means.

2. **Identifying the Classification**:
- The term "imperfect fungi" is synonymous with the classification known as Deuteromycetes. This classification is specifically for fungi that do not exhibit sexual reproduction.

3. **Role of Deuteromycetes**:
- Deuteromycetes play a crucial role in ecosystems as decomposers. They break down organic matter, such as litter, and contribute to mineral cycling by returning nutrients to the soil.

4. **Comparing Other Fungal Groups**:
- Other groups of fungi mentioned in the options (Ascomycetes, Basidiomycetes, and Phycomycetes) do have sexual reproduction stages in their life cycles. Therefore, they do not fit the definition of imperfect fungi.

5. **Conclusion**:
- Based on the characteristics and roles of these fungi, the correct answer to the question is **Deuteromycetes**.

### Final Answer:
The imperfect fungi which are decomposers of litter and help in mineral cycling belong to **Deuteromycetes**.