Number of visible sternal plates present at the abdomen of female cockroach is :

Options

A. 6
B. 7
C. 8
D. 9

Answer

To determine the number of visible sternal plates present at the abdomen of a female cockroach, follow these steps:

### Step-by-Step Solution:

1. **Understand the Structure of the Cockroach Abdomen**:
- The abdomen of a cockroach consists of 10 segments. Each segment has a corresponding sternal plate.

2. **Identify the Specifics for Female Cockroaches**:
- In female cockroaches, the 7th abdominal segment is broad-shaped. This is an important characteristic that differentiates it from male cockroaches.

3. **Count the Sternal Plates**:
- The sternal plates in the abdomen of female cockroaches include the 7th, 8th, and 9th segments.
- The 7th sternal plate is broad and contributes to the brood structure along with the 8th and 9th sternal plates.

4. **Final Count**:
- The total number of visible sternal plates in the abdomen of a female cockroach is 7. This includes the 7th sternal plate and the additional plates that are visible.

5. **Conclusion**:
- Therefore, the correct answer to the question is that there are **7 visible sternal plates** in the abdomen of a female cockroach.