Ovulation in human female normally takes place during the menstruation cycle :

Options

A. At the mid-secretory phase
B. At the end of proliferative phase
C. Just before the end of the secretory phase
D. At the begining of proliferative phase

Answer

### Step-by-Step Solution:

1. **Understanding the Menstrual Cycle**:
- The menstrual cycle in human females typically lasts about 28 days and is divided into four main phases: menstrual phase, proliferative phase (also known as the follicular phase), ovulation, and luteal phase (or secretory phase).

2. **Identifying the Phases**:
- **Menstrual Phase**: This phase lasts for about 5 to 7 days and involves bleeding (menstruation).
- **Proliferative Phase**: This phase occurs after the menstrual phase, usually from days 8 to 12, where the ovary prepares an ovum for release.
- **Ovulation**: This is the phase where the ovum is released from the ovary, typically occurring around the 13th or 14th day of the cycle.
- **Luteal Phase**: This phase lasts from days 15 to 28, where if fertilization occurs, the ovum moves to the endometrium; otherwise, both the ovum and endometrium degenerate.

3. **Locating Ovulation in the Cycle**:
- According to the typical cycle, ovulation occurs after the proliferative phase and before the luteal phase. Therefore, it is positioned at the end of the proliferative phase.

4. **Choosing the Correct Option**:
- Given the options:
a. At the mid-secretory phase
b. At the end of proliferative phase
c. Just before the end of secretory phase
d. At the beginning of proliferative phase
- The correct answer is **b. at the end of proliferative phase**, as this is when ovulation occurs.

### Final Answer:
**b. at the end of proliferative phase**