Number of ommatidia in each eye of cockroach is

Options

A. 1000
B. 2000
C. 3000
D. 4000

Answer

### Step-by-Step Solution:

1. **Understanding the Structure of the Cockroach**: The cockroach's body is divided into three main parts: the head, thorax, and abdomen. The head contains important sensory organs, including the compound eyes.

2. **Identifying the Eyes**: Each cockroach has compound eyes located on the dorsal part of its head. These eyes are crucial for its vision.

3. **Defining Ommatidia**: The compound eyes of the cockroach are made up of numerous small units called ommatidia. Each ommatidium is a hexagonal unit that contributes to the overall vision of the cockroach.

4. **Counting Ommatidia**: It is known that each compound eye of a cockroach contains approximately 2,000 ommatidia.

5. **Understanding the Function of Ommatidia**: The ommatidia work together to form multiple images of an object, which are then combined to create a single mosaic image. This type of vision is particularly useful for nocturnal animals like cockroaches, allowing them to see in low light conditions.

6. **Conclusion**: Therefore, the answer to the question regarding the number of ommatidia in each eye of the cockroach is 2,000.

### Final Answer:
The number of ommatidia in each eye of the cockroach is **2,000**.

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