Structural units found in the compound eye of cockroach are called :
(a) Rhabdom
(b) Cone cells
(c) Ommatidia
(d) Simple eye

Options

A. Rhabdom
B. Cone cells
C. Ommatidia
D. Simple eye

Answer

To answer the question about the structural units found in the compound eye of a cockroach, we can follow these steps:

### Step-by-Step Solution:

1. **Understand the Question**: The question asks for the structural units found in the compound eye of the cockroach.

2. **Identify the Options**: The options provided are:
- (a) Rhabdom
- (b) Cone cells
- (c) Ommatidia
- (d) Simple eye

3. **Analyze Each Option**:
- **Option (a) Rhabdom**: This is a light-sensitive structure but not a structural unit of the compound eye. It is a translucent cylinder that acts as a receptor for light.
- **Option (b) Cone cells**: These cells are involved in color perception and image formation but do not constitute the structural units of the compound eye.
- **Option (c) Ommatidia**: This is the correct answer. Ommatidia are the individual units that make up the compound eye of the cockroach. Each ommatidium contains photoreceptor cells and contributes to the overall vision.
- **Option (d) Simple eye**: This is incorrect as simple eyes are different from compound eyes and are not present in cockroaches.

4. **Conclusion**: Based on the analysis, the correct answer is (c) Ommatidia, as they are the structural units that form the compound eye of the cockroach.

### Final Answer:
(c) Ommatidia

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