Which one of the following is the incorrect matching of the events occurring during the menstrual cycle?

Options

A. The tertiary follicle further changes into the mature follicle or Graffian follicle.
B. Development of corpus luteum in the proliferative phase with increased secretion of progesterone.
C. The secondary oocyte forms a new membrane called zona pellucida.
D. The Graafian follicle ruptures to release the secondary occyte (ovum) from the ovary by the process called ovulation.

Answer

To solve the question regarding the incorrect matching of events occurring during the menstrual cycle, we will analyze each option provided.

### Step-by-Step Solution:

1. **Understanding the Menstrual Cycle**:
- The menstrual cycle consists of four main phases:
1. Menstrual phase
2. Follicular phase (also known as the proliferative phase)
3. Ovulation
4. Luteal phase

2. **Analyzing Each Option**:
- **Option 1**: "The tertiary follicle further changes into the mature follicle or Graafian follicle."
- This statement is **correct**. The tertiary follicle does develop into the Graafian follicle (mature follicle) during the follicular phase.

- **Option 2**: "Development of corpus luteum in the proliferative phase with increased secretion of progesterone."
- This statement is **incorrect**. The corpus luteum forms during the luteal phase, not the proliferative phase. The increased secretion of progesterone occurs during the luteal phase as well.

- **Option 3**: "The secondary oocyte forms a new membrane called zona pellucida."
- This statement is **correct**. The zona pellucida is formed around the secondary oocyte, which plays a crucial role in fertilization.

- **Option 4**: "The Graafian follicle ruptures to release the secondary oocyte (ovum) from the ovary by the process called ovulation."
- This statement is **correct**. The Graafian follicle does rupture during ovulation, releasing the secondary oocyte.

3. **Conclusion**:
- After analyzing all the options, we find that **Option 2** is the incorrect statement regarding the events of the menstrual cycle.

### Final Answer:
The incorrect matching of the events occurring during the menstrual cycle is:
**Option 2: Development of corpus luteum in the proliferative phase with increased secretion of progesterone.**

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