Which one the following statements is Not correct ?

Options

A. Rhodopsin is the purplish red protein present in rods only.
B. Retinal is the light absorbing portion of Vishal photo pigments.
C. In retina , the roda have the photo pigment rhodopsin while cones have three different photopigments.
D. Retinal is a derivative of vitamin C

Answer

To determine which statement is not correct, we will analyze each of the four statements provided in the question.

1. **Statement 1**: "Rhodopsin is the purplish red protein present in rods only."
- **Analysis**: This statement is correct. Rhodopsin, also known as visual purple, is indeed a purplish-red protein found in the photoreceptor cells called rods, which are responsible for vision in low light conditions.

2. **Statement 2**: "Retinal is the light absorbing portion of visual photopigments."
- **Analysis**: This statement is also correct. Retinal, which is a derivative of vitamin A, is the light-absorbing component of photopigments, including rhodopsin in rods and photopsins in cones. It plays a crucial role in converting light into electrical signals for vision.

3. **Statement 3**: "In retina, rods have the photopigment rhodopsin while cones have three different photopigments."
- **Analysis**: This statement is correct as well. Rods contain rhodopsin, while cones contain three different types of photopigments (iodopsins) that are sensitive to different wavelengths of light, enabling color vision.

4. **Statement 4**: "Retinol is a derivative of vitamin C."
- **Analysis**: This statement is incorrect. Retinol is actually a derivative of vitamin A, not vitamin C. This is a common misconception, but it is essential to note that retinol is crucial for vision and is involved in the formation of rhodopsin.

**Conclusion**: The statement that is not correct is **Statement 4**: "Retinol is a derivative of vitamin C."