Select the incorrect statement:

Options

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

Answer

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

### Step-by-Step Solution:

1. **Statement 1**: "Follicle stimulating hormone stimulates the Sertoli cells which help in spermogenesis."
- **Analysis**: This statement is correct. Follicle Stimulating Hormone (FSH) is known to stimulate Sertoli cells in the testes, which play a crucial role in the process of sperm maturation (spermatogenesis).

2. **Statement 2**: "LH triggers ovulation in the ovary."
- **Analysis**: This statement is also correct. Luteinizing Hormone (LH) is responsible for triggering ovulation, which is the release of an egg from the ovary.

3. **Statement 3**: "Luteinizing hormone or follicle stimulating hormone decreases gradually during the follicular phase."
- **Analysis**: This statement is incorrect. During the follicular phase of the menstrual cycle, the levels of LH and FSH actually increase to stimulate the growth of follicles in the ovary. They do not decrease gradually during this phase.

4. **Statement 4**: "Luteinizing hormone triggers the secretion of androgens from the Leydig cells."
- **Analysis**: This statement is correct. LH stimulates Leydig cells in the testes to produce androgens (such as testosterone), which are important for male reproductive functions.

### Conclusion:
The incorrect statement is **Statement 3**: "Luteinizing hormone or follicle stimulating hormone decreases gradually during the follicular phase."

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