All of the following structure in a cockroach has jointed segmental or filamentous structure except ,

Options

A. Anal style
B. Anal cerci
C. Antenna
D. Walking legs

Answer

To solve the question, we need to identify which structure in a cockroach is not jointed, segmented, or filamentous. Let's analyze the options step by step:

### Step 1: Understand the Structures
1. **Anal Style**: This is a thread-like structure found in male cockroaches at the end of the abdomen. It is a small, unsegmented structure that does not have joints.
2. **Anal Sarcae**: These are jointed, filamentous structures found in both male and female cockroaches in the 10th segment of the abdomen.
3. **Antennae**: These are sensory organs located on the head of the cockroach. They are also segmented and jointed.
4. **Walking Legs**: These are jointed and segmented structures that arise from the thorax and are used for locomotion.

### Step 2: Identify the Non-Jointed Structure
- The **Anal Style** is the only structure among the options that is not jointed or segmented. It is a simple, filamentous structure found only in males.

### Conclusion
Based on the analysis, the structure in a cockroach that does not have a jointed, segmental, or filamentous structure is the **Anal Style**.

### Final Answer
The correct answer is **Anal Style**.

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