The immature male germ cells undergo division to produce sperms by the process of spermatogenesis. Choose the correct one with reference to above.

Options

A. Spermatogonia have 46 chromosomes and always undergo meiotic cell division.
B. Primary spermatocytes divide by mitotic cell division.
C. Secondary spermatocytes have 23 chromosomes and undergo second meiotic division
D. Spermatozoa are transformed into spermatids.

Explanation

To solve the question regarding spermatogenesis and the characteristics of male germ cells, we can break it down into the following steps:

### Step-by-Step Solution:

1. **Understanding Spermatogenesis**:
- Spermatogenesis is the process through which immature male germ cells develop into mature sperm cells. This involves several stages of cell division and differentiation.

2. **Identifying Germ Cell Types**:
- The initial germ cells are called **spermatogonia**. These cells are diploid, meaning they contain 46 chromosomes (23 pairs).

3. **Division of Spermatogonia**:
- Spermatogonia undergo **mitotic division** to produce more spermatogonia, ensuring a continuous supply of germ cells. This is important for maintaining the germ cell line.

4. **Formation of Primary Spermatocytes**:
- Some spermatogonia will differentiate into **primary spermatocytes**, which are also diploid and contain 46 chromosomes.

5. **Meiosis I**:
- Primary spermatocytes undergo **meiosis I**, which reduces the chromosome number by half, resulting in two **secondary spermatocytes**, each containing 23 chromosomes (haploid).

6. **Meiosis II**:
- Each secondary spermatocyte then undergoes **meiosis II**, resulting in a total of four haploid cells called **spermatids**.

7. **Transformation into Spermatozoa**:
- The spermatids then undergo a transformation process to become mature sperm cells, known as **spermatozoa**.

8. **Correct Option**:
- Based on the information provided, the correct statement is that **secondary spermatocytes have 23 chromosomes and undergo the second meiotic division**.

### Final Answer:
The correct option is: **Option 3 - Secondary spermatocytes have 23 chromosomes and undergo second meiotic division.**

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