Identify the wrong statement from the follow- ing.

Options

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

Answer

To identify the wrong statement among the given options regarding human reproduction, we will analyze each statement step by step.

### Step 1: Understanding the Menstrual Cycle
The menstrual cycle is typically around 28 days and consists of several phases:
- **Menstrual Phase (Days 1-5)**: Shedding of the uterine lining.
- **Follicular Phase (Days 6-14)**: Follicle-stimulating hormone (FSH) promotes the growth of ovarian follicles, which produce estrogen.
- **Ovulation (Around Day 14)**: A surge in estrogen levels triggers the release of luteinizing hormone (LH), leading to ovulation.
- **Luteal Phase (Days 15-28)**: After ovulation, the corpus luteum forms and produces progesterone.

### Step 2: Evaluating the Statements
1. **High levels of estrogen trigger the ovulatory surge**: This statement is correct. Elevated estrogen levels lead to an increase in LH, resulting in ovulation.

2. **Oogonial cells start to proliferate and give rise to functional ova in regular cycles from puberty onwards**: This statement is also correct. Oogonial cells develop into primary oocytes, which eventually mature into functional ova during the menstrual cycle.

3. **Sperm released from seminiferous tubules are poorly motile or non-motile**: This statement is incorrect. Sperm are initially non-motile when they are released from the seminiferous tubules. They gain motility in the epididymis, where they mature and are stored.

4. **Progesterone levels are high during the post-ovulatory phase (secretory phase)**: This statement is correct. After ovulation, the corpus luteum secretes progesterone, which prepares the uterine lining for potential implantation.

### Step 3: Identifying the Wrong Statement
From the analysis above, the wrong statement is:
**"Sperm released from seminiferous tubules are poorly motile or non-motile."** This is incorrect because sperm gain motility in the epididymis after being released from the seminiferous tubules.

### Final Answer
The wrong statement is: **"Sperm released from seminiferous tubules are poorly motile or non-motile."**

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