Iodopsin is a light sensitive (photosensitive) pigment and is present in the

Options

A. Iris
B. Rods
C. Cones
D. Lens.

Answer

**Step-by-Step Solution:**

1. **Understanding Iodopsin**: Iodopsin is a light-sensitive pigment that plays a crucial role in vision. It is important to identify where this pigment is located in the eye.

2. **Identifying Types of Photoreceptors**: There are two main types of photoreceptors in the human eye: rods and cones. Rods contain a pigment called rhodopsin, while cones contain iodopsin.

3. **Function of Rods and Cones**: Rods are primarily responsible for vision in low light conditions (night vision), while cones are responsible for color vision and function best in bright light (day vision).

4. **Analyzing the Options**:
- **Iris**: This is a pigmented structure that regulates the amount of light entering the eye but does not contain any photosensitive pigments. Therefore, it is not the correct answer.
- **Rods**: While rods contain rhodopsin, they do not contain iodopsin, making this option incorrect for the question asked.
- **Cones**: Cones are the photoreceptor cells that contain iodopsin, making this the correct answer.
- **Lens**: The lens focuses light onto the retina but does not contain any photosensitive pigments, so this option is also incorrect.

5. **Conclusion**: Based on the analysis, the correct answer is that iodopsin is present in the **cones** of the eye.

**Final Answer**: Iodopsin is a light-sensitive pigment present in the **cones**.

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