Brood pouch is formed in female Cockroach by

Options

A. Seventh sternum
B. Eighth sternum
C. Ninth sternum
D. All the above

Answer

To determine which sternum forms the brood pouch in female cockroaches, we can follow these steps:

### Step-by-Step Solution:

1. **Understanding the Structure**:
- The female cockroach has a specialized structure known as the brood pouch, which is crucial for reproduction.

2. **Identifying the Sternums**:
- The cockroach abdomen consists of 10 segments, and each segment has a sternum. In the case of the female cockroach, the sternums are numbered from 1 to 10.

3. **Analyzing the 7th Sternum**:
- The 7th sternum in female cockroaches is boat-shaped. This unique shape plays a significant role in the formation of the brood pouch.

4. **Role of the 8th and 9th Sternums**:
- The 8th and 9th sternums also contribute to the formation of the brood pouch. Together with the 7th sternum, they create a broader structure.

5. **Formation of the Brood Pouch**:
- The brood pouch, also referred to as the genital pouch, is formed by the interaction of the 7th, 8th, and 9th sternums. The 7th sternum's boat shape, combined with the 8th and 9th sternums, creates this pouch.

6. **Conclusion**:
- Since the brood pouch is formed by the 7th, 8th, and 9th sternums, the correct answer to the question is "all of the above."

### Final Answer:
The brood pouch in female cockroaches is formed by the 7th, 8th, and 9th sternums. Therefore, the correct option is **all of the above**.

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