All algae have two photosynthetic pigments in common

Options

A. Chlorophyll a and phycobilins
B. Chlorophyll a and carotenoids
C. Chlorophyll a and chlorophyll b
D. Chlorophyll b and carotenoids.

Answer

To solve the question regarding the common photosynthetic pigments found in all algae, we can follow these steps:

### Step-by-Step Solution:

1. **Understanding Algae**:
- Algae are photosynthetic organisms that can be unicellular or multicellular. They are autotrophic, meaning they can produce their own food using light energy.

2. **Identifying Photosynthetic Pigments**:
- Photosynthetic pigments are essential for the process of photosynthesis. Different types of algae contain various pigments, but some are common across all groups.

3. **Common Pigments in Algae**:
- The two main pigments that are universally present in all algae are:
- **Chlorophyll a**: This pigment is essential for photosynthesis and is found in all types of algae.
- **Beta Carotene (Carotenoids)**: This pigment is also found in all algal groups and plays a role in light absorption.

4. **Evaluating the Options**:
- The options given are:
- A) Chlorophyll a and phycobilins
- B) Chlorophyll a and carotenoids
- C) Chlorophyll a and chlorophyll b
- D) Chlorophyll b and carotenoids
- Analyzing each option:
- **Option A**: Incorrect, as phycobilins are not found in all algae.
- **Option B**: Correct, as both chlorophyll a and carotenoids are present in all algae.
- **Option C**: Incorrect, because chlorophyll b is only found in green algae.
- **Option D**: Incorrect, for the same reason as option C.

5. **Conclusion**:
- The correct answer is **Option B: Chlorophyll a and carotenoids**.