The rods and cones of the eye retinal layer are modified :-

Options

A. Hair
B. Unipolar neurons
C. Bipolar neurons
D. Multipolar neurons

Answer

The question asks about the modification of rods and cones in the retinal layer of the eye. Let's break down the answer step by step.

### Step-by-Step Solution:

1. **Understanding Rods and Cones**:
- Rods and cones are photoreceptor cells located in the retina of the eye. They are responsible for converting light into neural signals.

2. **Structure of Rods and Cones**:
- Rods are cylindrical in shape and are more sensitive to light, allowing for vision in low-light conditions (scotopic vision).
- Cones are conical in shape and are responsible for color vision and function best in bright light (photopic vision).

3. **Modification of Rods and Cones**:
- Both rods and cones are modified neurons. They have specialized structures that allow them to respond to light stimuli.
- The outer segments of rods and cones contain photopigments (rhodopsin in rods and photopsins in cones) that undergo a chemical change when they absorb photons.

4. **Functionality**:
- When light hits these photopigments, it triggers a biochemical cascade that ultimately leads to the generation of an electrical signal, which is transmitted to the brain via the optic nerve.

5. **Conclusion**:
- Therefore, rods and cones are modified neurons that have adapted to detect light and contribute to vision.

### Final Answer:
Rods and cones of the eye retinal layer are modified neurons.

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