Which is not a sensory structure in Cockroach

Options

A. Antennae
B. Eyes
C. Anal cerci
D. Proventriculus

Answer

To determine which structure is not a sensory structure in a cockroach, we will analyze each option provided in the question.

### Step-by-Step Solution:

1. **Identify the Options**: The options given are:
- Antenna
- Eyes
- Anal saccae
- Proventriculus

2. **Evaluate the Antenna**:
- The antennae are sensory structures located on the head of the cockroach. They are sensitive to touch and have tactile receptors. Therefore, they are indeed sensory structures.

3. **Evaluate the Eyes**:
- The eyes of the cockroach are compound eyes, which are adapted for nocturnal vision. They contain photoreceptors that allow the cockroach to detect light. Thus, the eyes are also sensory structures.

4. **Evaluate the Anal Saccae**:
- Anal saccae are structures that arise from the abdomen of both male and female cockroaches. They contain receptors for touch and auditory stimuli. Therefore, anal saccae are also sensory structures.

5. **Evaluate the Proventriculus**:
- The proventriculus is part of the cockroach's digestive system. It is the gizzard that follows the crop, where food is processed. It does not contain sensory receptors and is not involved in sensing external stimuli.

6. **Conclusion**:
- Based on the evaluations, the structure that is not a sensory structure in the cockroach is the **Proventriculus**.

### Final Answer:
The correct answer is **Proventriculus**.

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