The process of maturation of reproductive cells of testes in male so as to form the male gamete or sperm is known as:

Options

A. Spermatogenesis
B. Gametogenesis
C. Oogenesis
D. None of these

Answer

To solve the question regarding the process of maturation of reproductive cells in the testes to form male gametes (sperm), we can follow these steps:

1. **Understanding the Question**: The question asks for the specific term that describes the maturation of reproductive cells in the male testes to produce sperm.

2. **Identifying Key Terms**: The key terms in the question are "maturation," "reproductive cells," "testes," and "male gamete or sperm."

3. **Defining Gametogenesis**: Gametogenesis is the general term for the formation of gametes (sperm and eggs). It includes two specific processes: spermatogenesis (formation of sperm) and oogenesis (formation of eggs).

4. **Focusing on Male Gametes**: Since the question specifically refers to male gametes, we need to focus on the process that occurs in the male reproductive system.

5. **Identifying the Correct Process**: The process that specifically refers to the formation and maturation of sperm in the testes is called spermatogenesis. This occurs in the seminiferous tubules of the testes.

6. **Conclusion**: Based on the definitions and processes discussed, the correct answer to the question is **spermatogenesis**.

### Final Answer:
The process of maturation of reproductive cells of testes in males to form the male gamete or sperm is known as **spermatogenesis**.