Most swollen segment in leg cockroach is :

Options

A. tarsus
B. coxa
C. femur
D. trochanter

Answer

To determine the most swollen segment in the leg of a cockroach, we can follow these steps:

### Step-by-Step Solution:

1. **Understand the Structure of Cockroach Legs**:
- Cockroaches have three pairs of legs, which are segmented into different parts: coxa, trochanter, femur, tibia, and tarsus.

2. **Identify Each Segment's Function**:
- **Coxa**: This is the uppermost segment of the leg and connects the leg to the body. It is the basal segment.
- **Trochanter**: This segment acts like a knee joint, allowing for bending of the leg.
- **Femur**: This segment functions similarly to the thigh in humans.
- **Tibia**: This segment is akin to the shin.
- **Tarsus**: This segment functions like the foot and ankle.

3. **Evaluate the Size of Each Segment**:
- Among these segments, the coxa is noted to be particularly large and swollen compared to the other segments.

4. **Conclusion**:
- Since the coxa is the largest and most swollen part of the leg, it is identified as the correct answer.

### Final Answer:
The most swollen segment in the leg of a cockroach is **Coxa** (Option B).

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