In cockroach anal styles are present on :

Options

A. Ninth sternite of female
B. Ninth sternite of male
C. Tenth sternite of male
D. Both (1) and (2)

Answer

To determine where anal styles are present in cockroaches, we can follow these steps:

### Step-by-Step Solution:

1. **Understand the Structure of Cockroach**:
- Cockroaches have a segmented body divided into three main parts: head, thorax, and abdomen. The abdomen consists of 10 segments, which are referred to as sternites.

2. **Identify the Sternites**:
- The sternites are the ventral (belly side) plates of the segments. In the case of cockroaches, the 9th and 10th sternites are particularly important for understanding the presence of anal styles.

3. **Examine the 9th and 10th Sternites**:
- The 9th sternite in male cockroaches has a specialized structure known as anal styles. These are not present in female cockroaches.
- The 10th sternite, on the other hand, has structures known as anal sarcai, which are present in both male and female cockroaches.

4. **Evaluate the Options**:
- Option A: 9th sternite of the female - Incorrect, as anal styles are not present in females.
- Option B: 9th sternite of the male - Correct, as anal styles are specifically found here in males.
- Option C: 10th sternite of the male - Incorrect for anal styles, as it has anal sarcai instead.
- Option D: Both 1 and 2 - Incorrect, since option 1 is wrong.

5. **Conclusion**:
- The correct answer is **Option B: 9th sternite of the male**, where anal styles are present.