Mark the correct option regarding accessory pigment molecules

Options

A. Consists of reaction center. xanthophylls and carotenoids
B. Consists of Chl-b, xanthophylls and carotenoids
C. Absorb wider range of wavelength of incoming light to be utilised for photosynthesis
D. Both (2) and (3)

Answer

To solve the question regarding accessory pigment molecules, we need to analyze the options provided and understand the role of accessory pigments in photosynthesis.

### Step-by-Step Solution:

1. **Understanding Accessory Pigments**: Accessory pigments are molecules that assist in the process of photosynthesis by capturing light energy. They are not the primary pigments that convert light energy into chemical energy but play a crucial role in light absorption.

2. **Identifying Components**: The light-harvesting complex consists of a reaction center and accessory pigments. The reaction center contains chlorophyll a, which is the primary pigment that can release electrons when it absorbs light.

3. **Role of Accessory Pigments**: Accessory pigments, such as chlorophyll b, xanthophyll, and carotenoids, do not release electrons like chlorophyll a. Instead, their primary function is to absorb a wider range of wavelengths of light and transfer that energy to the reaction center.

4. **Evaluating the Options**:
- **Option 1**: "Accessory pigment molecules consist of reaction center." - This is incorrect because the reaction center and accessory pigments are distinct components.
- **Option 2**: "Accessory pigment molecules consist of chlorophyll b, xanthophyll, and carotenoids." - This is correct as these are indeed types of accessory pigments.
- **Option 3**: "Accessory pigments absorb a wider range of wavelengths of incoming light to be utilized for photosynthesis." - This is also correct since accessory pigments help in capturing light energy effectively.
- **Option 4**: Since options 2 and 3 are correct, the correct answer is that both option 2 and option 3 are true.

5. **Conclusion**: The correct options regarding accessory pigment molecules are options 2 and 3.

### Final Answer:
The correct options regarding accessory pigment molecules are **2 and 3**.

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