Which of the following statement is incorrect about oogenesis?

Options

A. The Graafian follicle ruptures to release the secondary oocyte from the ovary by the process called ovulation.
B. Oogenesis is initiated during the embryonic development stage when a couple of million gamete mother cells (oogonia) are formed within each fetal ovary.
C. The primary oocyte undergoes a second unequal meiotic division resulting in the formation of a large haploid secondary oocyte and a tiny secondary polar body.
D. The secondary follicle transforms into a ary follicle which is characterized by a fluid-filled cavity called the antrum.

Answer

To determine which statement is incorrect about oogenesis, we will analyze each statement step by step.

### Step-by-Step Solution:

1. **Understanding Oogenesis**:
- Oogenesis is the process of egg (ovum) formation in females, which occurs in the ovaries. It involves several stages, starting from the embryonic development stage and continuing until ovulation.

2. **Analyzing the Statements**:
- **Statement 1**: "The graphene follicle ruptures to release the secondary oocyte from the ovary by the process called ovulation."
- This statement is correct. The graphene follicle indeed ruptures during ovulation to release the secondary oocyte.

- **Statement 2**: "Oogenesis is initiated during embryonic development."
- This statement is also correct. Oogenesis begins during the embryonic stage when oogonia (the precursor cells) are formed.

- **Statement 3**: "The primary oocyte undergoes second unequal meiotic division resulting in the formation of a large haploid secondary oocyte and a tiny secondary polar body."
- This statement is incorrect. The primary oocyte undergoes its first meiotic division, which is unequal, resulting in a large secondary oocyte and a smaller polar body. The second meiotic division occurs after fertilization.

- **Statement 4**: "The secondary follicle transforms into a tertiary follicle which is characterized by a fluid-filled cavity called antrum."
- This statement is correct. The secondary follicle does transform into a tertiary follicle, which has an antrum.

3. **Conclusion**:
- The incorrect statement about oogenesis is **Statement 3**. It incorrectly refers to the second meiotic division when it should refer to the first meiotic division.

### Final Answer:
The incorrect statement about oogenesis is: **"The primary oocyte undergoes second unequal meiotic division resulting in the formation of a large haploid secondary oocyte and a tiny secondary polar body."**

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