Which of the following process will be effected if the concentration of estrogen is low at the terminal stage of preovulatory phase ?

Options

A. Implantation
B. Oogenesis
C. Ovulation
D. Both (2) & (3)

Answer

To answer the question regarding which processes will be affected if the concentration of estrogen is low at the terminal stage of the preovulatory phase, we can follow these steps:

### Step-by-Step Solution:

1. **Understand the Role of Estrogen**:
- Estrogen plays a crucial role in the female reproductive system, particularly during the menstrual cycle. It is involved in the development of the ovarian follicles and the preparation of the ovum for ovulation.

2. **Identify the Preovulatory Phase**:
- The preovulatory phase occurs after menstruation and before ovulation. During this phase, estrogen levels rise, leading to the maturation of the follicles in the ovaries.

3. **Effects of Low Estrogen Levels**:
- If estrogen levels are low during the terminal stage of the preovulatory phase, it can negatively impact the processes of oogenesis (the production of ova) and ovulation (the release of the mature ovum from the ovary).

4. **Link to Other Hormones**:
- The low levels of estrogen can also affect the secretion of other hormones such as FSH (Follicle Stimulating Hormone) and LH (Luteinizing Hormone), which are critical for follicle development and ovulation.

5. **Conclusion**:
- Therefore, the processes that will be affected by low estrogen levels are primarily oogenesis and ovulation. The correct answer to the question is that both oogenesis and ovulation will be impacted.

### Final Answer:
The processes that will be affected if the concentration of estrogen is low at the terminal stage of the preovulatory phase are oogenesis and ovulation.