The abdomen of adult cockroaches has ………… segments.

Options

A. 4
B. 6
C. 8
D. 10

Answer

To determine the number of segments in the abdomen of adult cockroaches, follow these steps:

### Step-by-Step Solution:

1. **Identify the Classification**:
- Cockroaches belong to the phylum **Orthopoda**. This classification helps us understand their biological structure.

2. **Understand the Body Structure**:
- The body of a cockroach is divided into three main parts: **head**, **thorax**, and **abdomen**. This segmentation is crucial for understanding their anatomy.

3. **Focus on the Abdomen**:
- The abdomen is the posterior part of the cockroach's body. We need to find out how many segments it contains.

4. **Count the Segments**:
- It is known that the abdomen of an adult cockroach consists of **10 segments**. This is a key fact that answers the question directly.

5. **Identify Special Features**:
- Among these segments, the **7th, 8th, and 9th segments** are modified to form the genital region. Additionally, both sexes have a pair of jointed filamentous structures called **anal cerci** on the 10th segment.

6. **Select the Correct Answer**:
- Based on the information gathered, the correct answer to the question is that the abdomen of adult cockroaches has **10 segments**.

### Final Answer:
The abdomen of adult cockroaches has **10 segments** (Option D).

---