Select the incorrect statement.

Options

A. The lumen of seminiferous tubule contains Leydig cells which secrete testosterone
B. Testicular hormones are called androgens
C. In human , testes are extra - abdominal
D. Spermatogonium undergo mitotic divisions

Answer

To solve the question of selecting the incorrect statement, we will analyze each option one by one.

### Step-by-Step Solution:

1. **Examine the First Statement:**
- **Statement:** "The lumen of seminiferous tubule contains Leydig cells which secrete testosterone."
- **Analysis:** This statement is incorrect. The lumen of the seminiferous tubules contains Sertoli cells, which provide nourishment to the developing sperm. Leydig cells, which secrete testosterone, are located in the interstitial space outside the seminiferous tubules, not in the lumen.

2. **Examine the Second Statement:**
- **Statement:** "Testicular hormones are called androgens."
- **Analysis:** This statement is correct. Androgens are indeed the hormones produced by the testes, with testosterone being the most well-known androgen.

3. **Examine the Third Statement:**
- **Statement:** "In humans, testes are extra-abdominal."
- **Analysis:** This statement is also correct. The testes are located outside the abdominal cavity in the scrotum, which helps maintain a lower temperature necessary for sperm production.

4. **Examine the Fourth Statement:**
- **Statement:** "Spermatogonium undergo mitotic divisions."
- **Analysis:** This statement is correct. Spermatogonia are the germ cells in the testes that undergo mitosis to produce primary spermatocytes.

### Conclusion:
After analyzing all statements, the incorrect statement is the **first statement**: "The lumen of seminiferous tubule contains Leydig cells which secrete testosterone."

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