Excretory structures of rotifers

Options

A. renette glands
B. solenocytes
C. flame cells
D. nephridia

Answer

### Step-by-Step Solution:

1. **Understanding Rotifers**:
- Rotifers belong to the phylum Rotifera and are commonly referred to as "wheeled animals" due to the cilia that resemble wheels around their mouths. They are microscopic and have a pseudocoelom.

2. **Identifying Excretory Structures**:
- The question asks about the excretory structures in rotifers. The options provided are:
- A) Reynaed glands
- B) Solenocyte
- C) Flame cells
- D) Nephridia

3. **Analyzing Each Option**:
- **Reynaed glands**: These are excretory organs found in nematodes, not in rotifers.
- **Solenocyte**: This is an excretory structure found in certain cephalocordates and some platyhelminthes, but not in rotifers.
- **Flame cells**: These are specialized excretory cells found in rotifers and are responsible for the removal of waste.
- **Nephridia**: These are excretory organs found in annelids, such as earthworms, and are not present in rotifers.

4. **Conclusion**:
- Based on the analysis, the correct answer is **C) Flame cells**, as they are the excretory structures specific to rotifers.

### Final Answer:
The excretory structures of rotifers are **flame cells**.

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