The functional unit of testes of man is

Options

A. Uriniferous tubules
B. Malpighian tubules
C. Seminiferous tubules
D. Acini or lobules.

Answer

**Step-by-Step Solution:**

1. **Understanding the Question**: The question asks for the functional unit of the testes in males. This requires knowledge of the anatomy and physiology of the male reproductive system.

2. **Identifying the Options**: The options provided are:
- A. Uriniferous tubules
- B. Malpighian tubules
- C. Seminiferous tubules
- D. Acini or lobules

3. **Analyzing Each Option**:
- **A. Uriniferous tubules**: These are the functional units of the kidneys, not the testes.
- **B. Malpighian tubules**: These are found in insects and are not related to human anatomy.
- **C. Seminiferous tubules**: These are located within the testes and are responsible for the production of sperm. They are indeed the functional units of the testes.
- **D. Acini or lobules**: These structures are found in glands like the pancreas and are not related to the testes.

4. **Conclusion**: Based on the analysis, the correct answer is option C, the seminiferous tubules, as they are the functional units of the testes where spermatogenesis occurs.

5. **Final Answer**: The functional unit of testes of man is **C. Seminiferous tubules**.

---