Pigments present in Blue Green Algae include

Options

A. Chlorophyll 'a'
B. Phycocyanin
C. Phycoerythrin
D. All the above

Answer

### Step-by-Step Solution

1. **Identify the Organism**: The question asks about the pigments present in blue-green algae, which are scientifically known as cyanobacteria.

2. **Understand the Main Pigment**: The primary pigment involved in photosynthesis in cyanobacteria is **chlorophyll A**. This pigment is responsible for the green color of these organisms.

3. **Identify Accessory Pigments**: In addition to chlorophyll A, blue-green algae contain accessory pigments:
- **Phycocyanin**: This pigment gives the blue color to the cyanobacteria.
- **Phycoerythrin**: This pigment imparts a red color and is also found in red algae, but it can be present in cyanobacteria as well.
- **Carotenoids**: These pigments provide a yellow color and are also found in various photosynthetic organisms.

4. **Evaluate the Options**: The question provides four options:
- A) Chlorophyll A
- B) Phycocyanin
- C) Phycoerythrin
- D) All of the above

5. **Conclusion**: Since chlorophyll A, phycocyanin, and phycoerythrin are all present in blue-green algae, the correct answer is **D) All of the above**.

### Final Answer
The pigments present in blue-green algae include **D) all of the above**.

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