Identify the correct statement from the following.

Options

A. High levels of estrogen triggers the ovulatory surge.
B. Oogonial cells start to profiferate and give rise to functional ova in regular cycles from puberty onwards.
C. Sperms released from seminiferous tubules are highly motile.
D. Progesterone level is high during the post-ovulatory phase of menstrual cycle.

Answer

To solve the question of identifying the correct statement from the given options regarding human reproduction, we can follow these steps:

### Step-by-Step Solution:

1. **Analyze Option 1**: The statement claims that high levels of estrogen trigger the ovulatory surge.
- **Evaluation**: This is incorrect. It is actually the surge in luteinizing hormone (LH) that triggers ovulation, not estrogen. Therefore, this option is false.

2. **Analyze Option 2**: This statement suggests that oogonial cells proliferate and give rise to functional ova in regular cycles from puberty onwards.
- **Evaluation**: This is also incorrect. The process of oogonial cell proliferation and the formation of functional ova actually begins during the embryonic stage and continues until birth, not just from puberty. Hence, this option is false.

3. **Analyze Option 3**: The statement indicates that sperms released from the seminiferous tubules are highly motile.
- **Evaluation**: This statement is incorrect as well. Sperm released from the seminiferous tubules are not fully motile until they mix with secretions from the male accessory glands, which enhance their motility. Therefore, this option is false.

4. **Analyze Option 4**: This statement asserts that progesterone levels are high during the post-ovulatory phase of the menstrual cycle.
- **Evaluation**: This statement is correct. The post-ovulatory phase, also known as the luteal phase, involves the formation of the corpus luteum, which secretes high levels of progesterone to prepare the uterus for potential pregnancy. Thus, this option is true.

### Conclusion:
Based on the evaluations, the correct statement is **Option 4**: "Progesterone level is high during the post-ovulatory phase of the menstrual cycle."

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