Ocelli or fenestrae of Cockroach take part in

Options

A. Sight
B. Perception of temperature
C. Perception of light
D. Pereception of humidity

Answer

**Step-by-Step Text Solution:**

1. **Understanding the Anatomy of a Cockroach:**
- The cockroach, specifically Periplaneta americana, has a complex visual system that includes compound eyes and ocelli (also referred to as fenestrae).
- The compound eyes are made up of numerous units called ommatidia, which allow for a wide field of vision.

2. **Location of Ocelli:**
- Ocelli are located near the compound eyes of the cockroach. They are distinct from the compound eyes and are simpler in structure.

3. **Function of Ocelli:**
- Ocelli are considered to be underdeveloped simple eyes. Unlike compound eyes, they do not consist of ommatidia.
- The primary function of ocelli is to detect light. They are sensitive to changes in light intensity, which helps the cockroach respond to its environment.

4. **Differentiating Functions:**
- It is important to note that while the compound eyes are responsible for detailed vision (mosaic vision), the ocelli do not contribute to sight in the same way.
- Other sensory functions, such as temperature and humidity perception, are managed by the antennae, not the ocelli.

5. **Conclusion:**
- Based on the above understanding, the correct answer to the question is that the ocelli or fenestrae of the cockroach take part in the perception of light.

**Final Answer:** The ocelli or fenestrae of the cockroach take part in the perception of light.

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