Which one of the following is the correct difference between rod cells and cone cells of our retina ?

Options

A. `{:(,"Rod Cells ","Cone Cells "),("Distribution ","More concentrated in centre of retina","Evently distributed all over retina "):}`
B. `{:(,"Rod Cells ","Cone Cells "),("Visual acuity ","High","Low"):}`
C. `{:(,"Rod Cells ","Cone Cells "),("Visual pigment contained ","lodopsin","Rhodopsin"):}`
D. `{:(,"Rod Cells ","Cone Cells "),("Overall function ","Vision in poor light","Colour vision and detailed vision in bright light "):}`

Answer

To differentiate between rod cells and cone cells in the retina, we can follow these steps:

### Step-by-Step Solution:

1. **Definition of Rod and Cone Cells**:
- Rod cells and cone cells are two types of photoreceptor cells found in the retina of the eye. They play crucial roles in vision.

2. **Distribution**:
- Rod cells are primarily located in the periphery of the retina, while cone cells are concentrated in the center (fovea) of the retina.

3. **Number of Cells**:
- There are approximately 125 million rod cells in each eye, making them more numerous than cone cells, which number around 7 million in each eye.

4. **Visual Pigments**:
- The visual pigment in rod cells is called rhodopsin, which is sensitive to low light levels. In contrast, cone cells contain photopigments called opsins (specifically, three types: red, green, and blue opsins).

5. **Function**:
- Rod cells are responsible for vision in dim light (scotopic vision) and do not detect color, while cone cells are responsible for color vision and detailed vision in bright light (photopic vision).

6. **Visual Acuity**:
- Rod cells have lower visual acuity (sharpness of vision) compared to cone cells, which have high visual acuity.

7. **Response to Light**:
- Rod cells respond slowly to changes in light (adaptation to darkness), while cone cells respond quickly to light.

### Conclusion:
Based on the differences outlined above, the correct distinction between rod cells and cone cells is that rod cells are responsible for vision in poor light, while cone cells are responsible for color vision and detailed vision in bright light.