How is `7^(th)` sternum modified in female cockroach?

Explanation

### Step-by-Step Solution:

1. **Identify the Structure**: The question asks about the modification of the 7th sternum in female cockroaches. The sternum is a part of the exoskeleton in insects, specifically in the thoracic and abdominal segments.

2. **Understand the Modification**: In female cockroaches, the 7th sternum undergoes significant changes. It becomes larger in size compared to its male counterpart.

3. **Shape Transformation**: The modified 7th sternum takes on a distinct shape. It transforms into a boat-like shape, which is crucial for its function.

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