Read the following and select the incorrect statements:
A. The placenta acts as a permanent endocrine tissue and produces several hormones.
B. During pregnancy levels of cortisol, prolactin, thyroxine, and estrogen hormones also Increase several folds in maternal blood.
C. The second meiotic division of secondary oocyte in
females is unequal and results in the formation of a polar body.
D. The secondary follicle transforms into a tertiary follicle which is characterized by a fluid - filled cavity called the antrum.

Options

A. B & D only
B. A & c only
C. A & B only
D. A, B & C

Answer

To solve the question, we need to analyze each statement provided and determine which ones are incorrect.

### Step-by-Step Solution:

1. **Statement A**: "The placenta acts as a permanent endocrine tissue and produces several hormones."
- **Analysis**: This statement is incorrect. The placenta is not a permanent endocrine tissue; it is a temporary structure that forms during pregnancy and produces hormones essential for maintaining pregnancy, such as human chorionic gonadotropin (hCG), progesterone, and estrogen.

2. **Statement B**: "During pregnancy levels of cortisol, prolactin, thyroxine, and estrogen hormones also increase several folds in maternal blood."
- **Analysis**: This statement is also incorrect. While prolactin, thyroxine, and estrogen levels do increase during pregnancy, cortisol levels do not increase significantly. In fact, cortisol levels can fluctuate, and their increase is not as pronounced as the other hormones mentioned.

3. **Statement C**: "The second meiotic division of secondary oocyte in females is unequal and results in the formation of a polar body."
- **Analysis**: This statement is correct. During oogenesis, the secondary oocyte undergoes an unequal second meiotic division, resulting in one large ovum and a smaller polar body, which typically degenerates.

4. **Statement D**: "The secondary follicle transforms into a tertiary follicle which is characterized by a fluid-filled cavity called the antrum."
- **Analysis**: This statement is correct. The secondary follicle does develop into a tertiary follicle (also known as a Graafian follicle), which is characterized by the presence of an antrum, a fluid-filled cavity.

### Conclusion:
The incorrect statements are A and B.

### Final Answer:
The incorrect statements are A and B only.

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