Each of the following statements concerning the seminiferous epithelium is true except.

Options

A. (a) Before puberty, it contains spermatids
B. (b) It consists of sertoli cells and spermatogenic cells
C. (c) It has a robust basement membrane
D. (d) Its basal compartment contains spermatogonia

Answer

To solve the question regarding the statements about the seminiferous epithelium, we will analyze each statement provided and determine which one is incorrect.

### Step-by-Step Solution:

1. **Understanding the Structure of Seminiferous Epithelium**:
- The seminiferous epithelium is found in the seminiferous tubules of the testes and is responsible for the production of sperm. It consists of Sertoli cells and spermatogenic cells.

2. **Analyzing Each Statement**:
- **Statement A**: "Before puberty it contained spermatids."
- This statement is incorrect. Before puberty, the seminiferous epithelium does not contain spermatids. Spermatids develop only after puberty under the influence of testosterone.

- **Statement B**: "It consists of Sertoli cells and spermatogenic cells."
- This statement is correct. The seminiferous epithelium contains Sertoli cells, which support and nourish the developing sperm cells, and spermatogenic cells, which are involved in the formation of sperm.

- **Statement C**: "It has a robust basement membrane."
- This statement is correct. The seminiferous tubules have a robust basement membrane that provides structural support.

- **Statement D**: "Its basal compartment contains spermatogonia."
- This statement is correct. The basal compartment of the seminiferous tubules contains spermatogonia, which are the stem cells that give rise to sperm.

3. **Identifying the Exception**:
- After analyzing all statements, we find that Statement A is the only incorrect statement regarding the seminiferous epithelium.

### Conclusion:
The answer to the question is **A**: "Before puberty it contained spermatids."