Thermoreceptor sensillae of cockroach are located on

Options

A. Antennae, maxillary and labial palps
B. Tarsus of leg
C. Anal cerci and anal styles
D. Labrum, maxillae and labium

Answer

To answer the question regarding the location of thermoreceptor sensillae in cockroaches, we can follow these steps:

### Step-by-Step Solution:

1. **Understand the Question**: The question asks where the thermoreceptor sensillae are located in cockroaches.

2. **Identify the Options**: The options provided are:
- Option 1: Antenna, maxillary and labial pads
- Option 2: Tarsus of the leg
- Option 3: Anal sarca and anal stiles
- Option 4: Labrum, maxilla and labium

3. **Review the Anatomy of Cockroaches**:
- Cockroaches have various sense organs, including sensory organs and compound eyes.
- The thermoreceptor sensillae are specialized sensory structures that detect temperature changes.

4. **Locate the Thermoreceptor Sensillae**:
- According to the information, thermoreceptor sensillae are located in the first, second, and third segments of the tarsus of the leg.

5. **Evaluate Each Option**:
- **Option 1**: Antenna, maxillary and labial pads - These are located in the head region and do not contain thermoreceptor sensillae. (Incorrect)
- **Option 2**: Tarsus of the leg - This is the correct option as it is where the thermoreceptor sensillae are found. (Correct)
- **Option 3**: Anal sarca and anal stiles - These are found in the abdominal region and do not contain thermoreceptor sensillae. (Incorrect)
- **Option 4**: Labrum, maxilla and labium - These are parts of the mouth and also do not contain thermoreceptor sensillae. (Incorrect)

6. **Conclusion**: The correct answer is Option 2: Tarsus of the leg, as this is where the thermoreceptor sensillae are located in cockroaches.

### Final Answer:
The thermoreceptor sensillae of cockroach are located on the **tarsus of the leg**.

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