Anus in Cockroach occurs in

Options

A. Tenth sternum
B. Dorsal surface of 10th tergum
C. Ventral surface of 10th tergum
D. Ninth sternum

Answer

To determine where the anus in a cockroach occurs, we can follow these steps:

### Step-by-Step Solution:

1. **Understand the Anatomy of the Cockroach**:
- The cockroach has an abdomen made up of 10 segments. Each segment has specific structures and functions.

2. **Identify the Relevant Segments**:
- The 7th, 8th, and 9th sterna are involved in forming the genital pouch in female cockroaches. This indicates that the anus is not located in these segments.

3. **Examine the 10th Segment**:
- The 10th segment is crucial as it contains structures related to the anus. Both male and female cockroaches have a filamentous structure known as anal saccae in this segment.

4. **Determine the Location of the Anus**:
- The anus is specifically located on the ventral surface of the 10th segment, which is the lower side of the segment.

5. **Evaluate the Options**:
- Given the options:
1. 10th sternum
2. Dorsal surface of 10th sternum
3. Ventral surface of 10th sternum
4. 9th sternum
- The correct answer is the ventral surface of the 10th sternum.

### Final Answer:
The anus in a cockroach occurs on the **ventral surface of the 10th sternum**.

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