The coloured part of the eye which controls the amount of light of light entering the eye is a modified part of the

Options

A. Sclerotic and choroid
B. retina
C. Choroid
D. Choroid and retina

Answer

To solve the question, "The coloured part of the eye which controls the amount of light entering the eye is a modified part of the," we need to identify the correct structure of the eye that fits this description.

### Step-by-Step Solution:

1. **Understanding the Question**: The question asks for the colored part of the eye that regulates light entry. This indicates we are looking for a structure that is both colored and has a function related to light control.

2. **Identifying Eye Structures**: The main structures of the eye include:
- **Sclera**: The white outer layer of the eye.
- **Retina**: The inner layer that detects light and sends signals to the brain.
- **Choroid**: A layer containing blood vessels that supplies nutrients to the eye.
- **Iris**: The colored part of the eye that controls the size of the pupil and thus the amount of light entering the eye.

3. **Analyzing Each Structure**:
- **Sclera**: This is not colored and does not control light entry.
- **Retina**: While it is crucial for vision, it does not control light entry.
- **Choroid**: While it is a vascular structure, it does not directly control light entry.
- **Iris**: This is the colored part of the eye that adjusts the size of the pupil, thereby controlling the amount of light that enters the eye.

4. **Conclusion**: The correct answer is the **Iris**, as it is the colored part of the eye that regulates light entry.

### Final Answer:
The colored part of the eye which controls the amount of light entering the eye is a modified part of the **Iris**.