Read the following sentences about human reproduction:
A. The process of childbirth or parturition is induced by a complex neuroendocrine mechanism involving oxytocin.
B. The reproductive cycle of all primate mammals is called the menstrual cycle.
C. Most of the major organ systems of the foetus including genital organ systems of the foetus including genital organs are developed by the end of 24 weeks.
D . The second meiotic division of secondary oocyte is unequal and results in the formation of an ovum and a second polar body.
How many from the above is/ are incorrect ?

Options

A. four
B. Three
C. Two
D. One

Answer

To determine how many statements about human reproduction are incorrect, we will analyze each statement one by one.

### Step 1: Analyze Statement A
**Statement A:** "The process of childbirth or parturition is induced by a complex neuroendocrine mechanism involving oxytocin."
- **Analysis:** This statement is correct. Parturition is indeed regulated by oxytocin, which is released from the pituitary gland and stimulates uterine contractions.

### Step 2: Analyze Statement B
**Statement B:** "The reproductive cycle of all primate mammals is called the menstrual cycle."
- **Analysis:** This statement is partially misleading. While the menstrual cycle is characteristic of primates (including humans), not all mammals have a menstrual cycle; many have an estrous cycle instead. Therefore, this statement is incorrect.

### Step 3: Analyze Statement C
**Statement C:** "Most of the major organ systems of the fetus including genital organs are developed by the end of 24 weeks."
- **Analysis:** This statement is incorrect. Major organ systems, including genital organs, typically develop by the end of the first trimester (around 12 weeks), not 24 weeks. Thus, this statement is also incorrect.

### Step 4: Analyze Statement D
**Statement D:** "The second meiotic division of secondary oocyte is unequal and results in the formation of an ovum and a second polar body."
- **Analysis:** This statement is correct. The second meiotic division of the secondary oocyte does result in one large ovum and a smaller second polar body, which is a characteristic of oogenesis.

### Conclusion
Now, we summarize the findings:
- Statement A: Correct
- Statement B: Incorrect
- Statement C: Incorrect
- Statement D: Correct

Thus, **2 statements are incorrect** (B and C).

### Final Answer
**2 statements are incorrect.**