In blue green algae, attached to the free living thylakoids, present small granules containing photosynthetic pigments. These granules are called

Options

A. (a) phycobilisomes
B. (b) poly `beta`-hydroxybutyric acid (PBH) granules
C. (c) plastids
D. (d) chloroplast

Answer

To answer the question regarding the small granules containing photosynthetic pigments in blue-green algae (cyanobacteria), we can follow these steps:

### Step-by-Step Solution:

1. **Identify the Organism**: Recognize that blue-green algae are also known as cyanobacteria. They are a type of prokaryotic organism that can perform photosynthesis.

2. **Understand the Structure**: In cyanobacteria, photosynthesis occurs in specialized structures. These organisms do not have well-defined nuclei or organelles like eukaryotic cells.

3. **Recognize the Photosynthetic Pigments**: Cyanobacteria contain several photosynthetic pigments, including chlorophyll-a, carotenoids, and phycobilins. These pigments are crucial for capturing light energy during photosynthesis.

4. **Identify the Granules**: The small granules that contain these photosynthetic pigments are specifically known as phycobilisomes. These granules are attached to the thylakoids, which are the sites of photosynthesis in cyanobacteria.

5. **Evaluate the Options**:
- Option A: Phycobilisomes - This is the correct answer as it refers to the granules containing photosynthetic pigments.
- Option B: Poly-beta hydroxybutyric acid - This is incorrect as it is a polymer and does not contain photosynthetic pigments.
- Option C: Plastids and chloroplasts - These are found in eukaryotic cells and are not the correct answer for cyanobacteria.

6. **Conclusion**: Based on the information and evaluation of options, the correct answer is **phycobilisomes**.

### Final Answer:
The small granules containing photosynthetic pigments in blue-green algae (cyanobacteria) are called **phycobilisomes**.

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