The gynovalvular plates in female cockroach are modification of :

Options

A. 7th tergum
B. 7th sternum
C. 8th Tergum
D. 8 sternum

Answer

To answer the question regarding the gynovalvular plates in female cockroaches, we can follow these steps:

### Step-by-Step Solution:

1. **Understand the Structure**: The gynovalvular plates are specific structures found in female cockroaches. They play a role in the reproductive system, particularly during copulation.

2. **Identify the Options**: The options provided are:
- 7th tergum
- 7th sternum
- 8th tergum
- 8th sternum

3. **Recall Anatomical Knowledge**: In the anatomy of cockroaches, the tergum refers to the dorsal (top) part of the body segments, while the sternum refers to the ventral (bottom) part.

4. **Determine the Origin of Gynovalvular Plates**: Based on biological knowledge, the gynovalvular plates are derived from the 7th sternum. This means that they are modifications of this specific structure.

5. **Eliminate Incorrect Options**: The other options (7th tergum, 8th tergum, and 8th sternum) do not relate to the formation of the gynovalvular plates in female cockroaches.

6. **Conclude the Correct Answer**: Therefore, the correct answer to the question is that the gynovalvular plates in female cockroaches are modifications of the **7th sternum**.

### Final Answer:
The gynovalvular plates in female cockroaches are modifications of the **7th sternum**.

---