Brood pouch in female Periplaneta americane is composed of :

Options

A. `7^(th)` sternum + `8^(th) & 9^(th)` tergum
B. `7^(th) & 8^(th)` sternum `+9^(th)` tergum
C. `7^(th) , 8^(th) and 9^(th)` sternum
D. 7th sternum only

Answer

To solve the question regarding the composition of the brood pouch in female Periplaneta americana, we can follow these steps:

### Step-by-Step Solution:

1. **Identify the Organism**: The question refers to the female Periplaneta americana, commonly known as the American cockroach.

2. **Understand the Anatomy**: In both male and female Periplaneta americana, the abdomen consists of 10 segments. However, the structure of the abdomen differs between the sexes.

3. **Locate the Brood Pouch**: The brood pouch is a specialized structure found in the female. It is formed by specific segments of the abdomen.

4. **Identify the Relevant Sternum**: The brood pouch in the female is primarily formed by the 7th sternum, which is broad-shaped.

5. **Include Adjacent Structures**: In addition to the 7th sternum, the 8th and 9th sterna also contribute to the formation of the brood pouch.

6. **Summarize the Composition**: Therefore, the brood pouch in female Periplaneta americana is composed of the 7th, 8th, and 9th sterna.

7. **Select the Correct Option**: Based on the analysis, the correct answer to the question is that the brood pouch is composed of the 7th, 8th, and 9th sterna.

### Final Answer:
The brood pouch in female Periplaneta americana is composed of the 7th, 8th, and 9th sterna.

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