Which one provides colour vision in mammals?
(a) Lens
(b) Cone cells
(c) Cornea
(d) Rod cells

Options

A. Lens
B. Cone cells
C. Cornea
D. Rod cells.

Answer

To solve the question "Which one provides colour vision in mammals?" we will analyze each option given:

1. **Understanding the Question**: The question is asking which structure or cells are responsible for color vision in mammals.

2. **Analyzing the Options**:
- **(a) Lens**: The lens is a transparent structure in the eye that helps to focus light onto the retina. However, it does not play a role in color vision.
- **(b) Cone cells**: Cone cells are photoreceptor cells located in the retina. They are specifically responsible for color vision as they contain different pigments that respond to various wavelengths of light, allowing us to perceive colors.
- **(c) Cornea**: The cornea is the outermost layer of the eye that helps to focus light. Similar to the lens, it does not contribute to color vision.
- **(d) Rod cells**: Rod cells are another type of photoreceptor in the retina, but they are primarily responsible for vision in low light conditions and do not contribute to color vision.

3. **Conclusion**: Based on the analysis, the correct answer is **(b) Cone cells**. They are the cells that provide color vision in mammals.

### Step-by-Step Solution:
1. Identify the question: Which structure provides color vision in mammals?
2. Review each option:
- Lens: Not involved in color vision.
- Cone cells: Responsible for color vision.
- Cornea: Not involved in color vision.
- Rod cells: Not involved in color vision.
3. Determine the correct answer: Cone cells (option b) provide color vision in mammals.