In female cockroach 7th segment (sternum) is :

Options

A. Annular
B. Boat shaped
C. Filamentous
D. Spiral

Answer

To answer the question regarding the 7th segment (sternum) in female cockroaches, we can follow these steps:

### Step-by-Step Solution:

1. **Identify the Structure**: The question asks about the 7th sternum in female cockroaches. The sternum is a part of the exoskeleton in arthropods, including cockroaches.

2. **Understand the Function**: The 7th sternum in female cockroaches is involved in reproductive functions. It plays a role in the formation of the brood or genital pouch.

3. **Analyze the Modifications**: The 7th sternum, along with the 8th and 9th sternum, forms a broad-shaped structure known as the brood pouch. This pouch is crucial for the reproductive system of the female cockroach.

4. **Identify Key Features**: The anterior part of this brood pouch contains important structures such as the female gonophore, spermathecal pore, and collateral gland.

5. **Determine the Shape**: The shape of the 7th sternum in female cockroaches is described as broad or boat-shaped. This is a modification that supports its reproductive function.

6. **Select the Correct Answer**: Based on the analysis, the correct answer to the question is that the 7th sternum in female cockroaches is "broad-shaped."

### Final Answer:
The 7th segment (sternum) in female cockroaches is broad-shaped.

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