Select the incorrect statement

Options

A. LH triggers ovulation in ovary.
B. LH and FSH decrease gradually during the follicular phase.
C. LH triggers secretion of androgens from the Leydig cells.
D. FSH stimulates the sertoli cells which help in spermiogenesis

Answer

To determine the incorrect statement regarding the roles of LH (Luteinizing Hormone) and FSH (Follicle Stimulating Hormone) in human reproduction, we can analyze each statement provided in the question.

### Step-by-Step Solution:

1. **Understanding LH and its Role**:
- Luteinizing Hormone (LH) is responsible for triggering ovulation in females. It causes the mature follicle (Graafian follicle) to rupture and release the secondary oocyte.
- **Statement**: "LH triggers ovulation in ovary."
- **Evaluation**: This statement is **true**.

2. **Understanding FSH and its Role**:
- Follicle Stimulating Hormone (FSH) is crucial for the growth and maturation of ovarian follicles in females and stimulates Sertoli cells in males, which support sperm development.
- **Statement**: "LH and FSH decrease gradually during the follicular phase."
- **Evaluation**: This statement is **incorrect**. Both LH and FSH actually increase during the follicular phase to promote follicular development.

3. **LH and Androgen Secretion**:
- LH stimulates Leydig cells (not leading cells) in males to secrete androgens, which are important for spermatogenesis.
- **Statement**: "LH triggers secretion of androgens from the leading cells."
- **Evaluation**: This statement is **true**, but it should be noted that the correct term is Leydig cells.

4. **FSH and Sertoli Cells**:
- FSH acts on Sertoli cells in the testes to facilitate sperm production (spermatogenesis).
- **Statement**: "FSH stimulates the Sertoli cells which help in spermatogenesis."
- **Evaluation**: This statement is **true**.

### Conclusion:
The incorrect statement is: **"LH and FSH decrease gradually during the follicular phase."**