Mark the incorrect statement with regard to human reproduction

Options

A. Polyspermy is prevented by depolarisation of the membrane is called as fast block
B. Entry of sperm into ovum restarts the cell cycle by breaking down MPF and turning on the APC
C. If implantaion occurs anywhere else other than uterus , it is called tubal pregnancy
D. Ability to reproduce is lost in female primate after menopause

Answer

To solve the question "Mark the incorrect statement with regard to human reproduction," we will analyze each statement provided and determine which one is incorrect.

### Step-by-Step Solution:

1. **Evaluate Statement 1:**
- **Statement:** "Polyspermy is prevented by depolarization of the membrane and is called as a fast block."
- **Analysis:** This statement is true. Polyspermy, which is the fertilization of an ovum by more than one sperm, is indeed prevented by the depolarization of the ovum's membrane, known as the fast block mechanism.

2. **Evaluate Statement 2:**
- **Statement:** "The entry of the sperm into the ovum restarts the cell cycle by breaking down the mitosis metaphase promoting factor and turning on the anaphase promoting factor."
- **Analysis:** This statement is also true. The entry of sperm introduces centrioles into the ovum, which leads to the breakdown of the metaphase promoting factor and activates the anaphase promoting factor, allowing the cell cycle to progress.

3. **Evaluate Statement 3:**
- **Statement:** "If implantation occurs anywhere other than the uterus it is called as tubal pregnancy."
- **Analysis:** This statement is incorrect. The correct term for implantation occurring outside the uterus is "ectopic pregnancy." Tubal pregnancy specifically refers to implantation in the fallopian tube, which is a type of ectopic pregnancy, but not all ectopic pregnancies are tubal.

4. **Evaluate Statement 4:**
- **Statement:** "Ability to reproduce is lost in the females after menopause."
- **Analysis:** This statement is true. After menopause, the ovaries undergo atresia, and hormonal levels decrease, leading to the cessation of ovulation and menstrual cycles, resulting in the loss of reproductive ability.

### Conclusion:
- The incorrect statement is **Statement 3**: "If implantation occurs anywhere other than the uterus it is called as tubal pregnancy." This should be referred to as ectopic pregnancy.

### Final Answer:
- **Mark the incorrect statement:** Statement 3

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