In cockroach, eye consists of visual units called

Options

A. Ostia
B. Ommatidia
C. Gonapophyses
D. Spiracles

Explanation

**Step-by-Step Solution:**

1. **Understanding the Question**: The question asks about the visual units in the eyes of a cockroach.

2. **Identifying the Type of Eye**: Cockroaches possess compound eyes, which are a characteristic feature of many arthropods.

3. **Defining Visual Units**: The visual units in compound eyes are called ommatidia. Each ommatidium is a small, independent optical unit that contributes to the overall vision of the organism.

4. **Structure of Ommatidia**: Each ommatidium consists of a cluster of photoreceptors, which are responsible for detecting light. These photoreceptors are surrounded by support cells and pigment cells.

5. **Function of Ommatidia**: The multiple ommatidia work together to capture several images, which combine to form a complete vision known as mosaic vision.

6. **Conclusion**: Based on the information, the visual units in the eyes of a cockroach are called ommatidia.

**Final Answer**: The visual units in the eyes of a cockroach are called **ommatidia**.

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