The daylight/photopic or colour vision and twilight/scotopic vision are function of respectively

Answer

To answer the question regarding the functions of daylight/photopic (color vision) and twilight/scotopic vision, we can break down the solution into the following steps:

### Step-by-Step Solution:

1. **Understanding Photoreceptor Cells**:
- The retina of the eye contains specialized cells known as photoreceptors. These cells are responsible for converting light into neural signals.

2. **Types of Photoreceptors**:
- There are two main types of photoreceptor cells: rods and cones.
- **Rods**: These photoreceptors are highly sensitive to light and are primarily responsible for vision in low-light conditions (twilight or scotopic vision).
- **Cones**: These photoreceptors function best in bright light and are responsible for color vision (daylight or photopic vision).

3. **Photopigments**:
- Rods contain a photopigment called rhodopsin, which is sensitive to low light levels.
- Cones contain different types of photopigments (iodopsins) that allow them to detect color in bright light.

4. **Function of Rods and Cones**:
- **Rods**: Enable vision in dim light and are responsible for detecting movement and shapes but not color.
- **Cones**: Allow for the perception of color and detail in well-lit conditions.

5. **Conclusion**:
- Therefore, the functions of daylight/photopic or color vision and twilight/scotopic vision are attributed to cones and rods, respectively.

### Final Answer:
- The daylight/photopic or color vision is a function of **cones**, while twilight/scotopic vision is a function of **rods**.

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