The excretory structure of Amphioxus (Cephalochordate) is

Options

A. Flame cell/ Solenocyte
B. Coxal gland
C. Malpighian tubules
D. Green gland

Answer

### Step-by-Step Solution:

1. **Identify the Organism**: The question asks about the excretory structure of Amphioxus, which is a type of Cephalochordate. Amphioxus is a lower chordate.

2. **Understand Excretory Structures**: In Amphioxus, the primary excretory structures are flame cells and solenocytes. These structures are responsible for excretion and osmoregulation.

3. **Function of Flame Cells and Solenocytes**:
- **Flame Cells**: These cells are involved in the filtration of waste products and play a role in osmoregulation, helping to maintain the balance of water and salts in the organism.
- **Solenocytes**: Similar to flame cells, solenocytes also assist in osmoregulation and ion regulation, ensuring that the internal environment of the organism remains stable.

4. **Differentiate from Other Structures**:
- Coccygeal glands, malpighian tubules, and green glands are excretory structures found in non-chordates (like insects and other invertebrates). Therefore, they are not applicable to Amphioxus.

5. **Conclusion**: The correct answer to the question regarding the excretory structure of Amphioxus is flame cells and solenocytes.

### Final Answer:
The excretory structure of Amphioxus (Cephalochordate) is flame cells and solenocytes.

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