Which of the following events is not associated with ovulation in human female?

Options

A. Decrease in estradiol
B. Full development of graafian follicle
C. release of secondary oocyte
D. LH surge

Answer

To determine which event is not associated with ovulation in human females, we need to analyze the options provided in the context of what occurs during ovulation.

### Step-by-Step Solution:

1. **Understand Ovulation**: Ovulation is the process where an egg (oocyte) is released from the ovary into the fallopian tube. This typically occurs around the 12th to 14th day of the menstrual cycle.

2. **Identify the Events Associated with Ovulation**:
- **Increase in Estrogen Levels**: During ovulation, estrogen levels, particularly estradiol, rise sharply. This increase is crucial for triggering the release of the egg.
- **Full Development of the Follicle**: The follicle must fully develop to release the egg. This is a key event that occurs during ovulation.
- **Release of Second Oocyte**: The actual release of the second oocyte (egg) is the hallmark of ovulation.

3. **Analyze the Options**:
- **Decreasing Estradiol**: This option suggests a decrease in estradiol levels. However, during ovulation, estradiol levels actually increase significantly.
- **Full Development of Follicle**: This is associated with ovulation as the follicle must mature fully for ovulation to occur.
- **Release of Second Oocyte**: This is the primary event of ovulation.
- **Ellipsoid**: This term is not commonly associated with ovulation and may refer to a shape rather than a biological event.

4. **Conclusion**: The event that is not associated with ovulation is **decreasing estradiol**. This decrease is more related to menopause and not the ovulation process.

### Final Answer:
**Decreasing Estradiol** is not associated with ovulation in human females.