Which of the following are called accessory pigment ?
A. Chlorophyll a
B. Chlorophyll b
C. Carotenoids
D. Xanthophylls

Options

A. A, B and C
B. A, C and D
C. B, C and D
D. A, B, C and D

Answer

To determine which of the following are called accessory pigments, we can analyze each option provided:

1. **Chlorophyll a**: This is the primary pigment involved in photosynthesis. It is essential for capturing light energy and is located at the reaction center. Therefore, it is not considered an accessory pigment.

2. **Chlorophyll b**: This pigment assists chlorophyll a by capturing light energy at different wavelengths. It is considered an accessory pigment because it helps in the absorption of light and transfers that energy to chlorophyll a.

3. **Carotenoids**: These are pigments that provide yellow, orange, and red colors in plants. They also absorb light energy and protect the plant from excessive light. Carotenoids are classified as accessory pigments.

4. **Xanthophylls**: These are a type of carotenoid that contains oxygen. Like carotenoids, xanthophylls absorb light energy and help in photosynthesis, making them accessory pigments as well.

Based on this analysis, the accessory pigments among the options provided are:

- **Chlorophyll b**
- **Carotenoids**
- **Xanthophylls**

Thus, the correct answer is **B, C, and D**.

### Summary of the Answer:
The accessory pigments are:
- **Chlorophyll b**
- **Carotenoids**
- **Xanthophylls**