Rods are sensitive to

Options

A. Dim light
B. High intensity light
C. Colour perception
D. All the above.

Answer

**Step-by-Step Solution:**

1. **Understanding Photoreceptors**: The human retina contains two main types of photoreceptor cells: rods and cones. Each type has a different function in vision.

2. **Function of Rods**: Rods are primarily responsible for vision in low-light conditions. They are sensitive to light but do not detect color. This makes them crucial for night vision or scotopic vision.

3. **Rhodopsin Pigment**: Rods contain a pigment called rhodopsin, which is sensitive to light. This pigment allows rods to respond to dim light effectively.

4. **Comparison with Cones**: In contrast, cones are responsible for color vision and function best in bright light conditions (photopic vision). They contain different pigments (iodopsin, polypyrosine, and synopsin) that allow them to detect various colors.

5. **Conclusion**: Since rods are specifically adapted to function in dim light, the correct answer to the question "Rods are sensitive to" is **dim light**.

**Final Answer**: Dim light

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