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, let's analyze each of the provided statements one by one:

1. **Statement 1:** "Rhodopsin is the purplish red protein present in rods only."
- This statement is correct. Rhodopsin is indeed a purplish-red protein found in rod cells (rods) of the retina.

2. **Statement 2:** "Retinal is the light-absorbing portion of visual photopigments."
- This statement is also correct. Retinal is the chromophore that absorbs light in various photopigments, including rhodopsin.

3. **Statement 3:** "In retina, the rods have the photopigment rhodopsin, while cones have three different photopigments."
- This statement is correct as well. Rods contain rhodopsin, while cones contain three different types of photopigments (red, green, and blue).

4. **Statement 4:** "Retinal is a derivative of vitamin C."
- This statement is incorrect. Retinal is actually a derivative of vitamin A, not vitamin C.

Based on the analysis, the statement that is not correct is **Statement 4**.

### Final Answer:
The statement that is not correct is: **"Retinal is a derivative of vitamin C."**