Number of sterna visible in male Cockroach is

Options

A. Nine
B. Ten
C. Eight
D. Eleven

Answer

To determine the number of sterna visible in male cockroaches, we can follow these steps:

### Step-by-Step Solution:

1. **Understand the Structure**: The cockroach has a segmented body, and the abdomen consists of several segments, each with a corresponding sternum (the ventral plate of each segment).

2. **Identify Male Characteristics**: In male cockroaches, the genital pouch is located at the hind end of the abdomen. This pouch is important for reproduction.

3. **Locate the Boundaries**: The genital pouch is bounded dorsally (from above) by the 9th and 10th tergum (the dorsal plate of the segments). This means that these two segments are crucial in understanding the structure of the male abdomen.

4. **Examine the Ventral Side**: On the ventral side (the underside), the genital pouch is bounded by the 9th sternum.

5. **Count the Sterna**: In male cockroaches, there are only 9 visible sterna. The 10th sternum is absent in males, which means it does not contribute to the count.

6. **Conclusion**: Therefore, the total number of sterna visible in male cockroaches is 9.

### Final Answer:
The number of sterna visible in male cockroaches is **9**.

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