A female cockroach can be differentiated from a male cockroach, due to the presence of :

Options

A. Boat-shaped `7^(th)` sternum forming brood pouch
B. Anal style in `9^(th)` abdominal segment
C. Anal cerci in 10th abdominal segment
D. Both (A) and (C )

Answer

To determine how a female cockroach can be differentiated from a male cockroach, we can analyze the options provided in the question step by step.

### Step-by-Step Solution:

1. **Understanding the Anatomy of Cockroaches**:
- Cockroaches have distinct anatomical features that can help differentiate between males and females.

2. **Analyzing the First Option**:
- The first option mentions a "board-shaped 7th sternum forming a brood pouch."
- While it is true that female cockroaches have a brood pouch, this structure is not located in the 7th sternum but rather in the 9th segment.
- Therefore, this option is incorrect.

3. **Analyzing the Second Option**:
- The second option refers to the "annal style in the 9th abdominal segment."
- The annal style is indeed a feature that is present only in female cockroaches and is located in the 9th abdominal segment.
- This option is correct.

4. **Analyzing the Third Option**:
- The third option discusses "annulsarcai in the 10th abdominal segment."
- Annulsarcai are present in both male and female cockroaches, making this feature non-differentiating.
- Thus, this option is also incorrect.

5. **Conclusion**:
- After analyzing all options, the correct answer is that a female cockroach can be differentiated from a male cockroach due to the presence of the annal style in the 9th abdominal segment.

### Final Answer:
A female cockroach can be differentiated from a male cockroach due to the presence of **annal style in the 9th abdominal segment**.

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