Plastids are not found in

Options

A. fungi
B. bacteria
C. blue-green algae
D. all of these

Answer

To solve the question "Plastids are not found in," we need to analyze the options provided and understand the characteristics of plastids and the organisms mentioned.

### Step-by-Step Solution:

1. **Understanding Plastids**:
- Plastids are double membrane-bound organelles found in eukaryotic cells.
- They are primarily involved in photosynthesis (e.g., chloroplasts contain chlorophyll).

2. **Identifying Eukaryotes vs. Prokaryotes**:
- Eukaryotes are organisms with complex cells that contain a nucleus and membrane-bound organelles (e.g., plants, animals, fungi).
- Prokaryotes are simpler organisms without a nucleus or membrane-bound organelles (e.g., bacteria, archaea).

3. **Analyzing Each Option**:
- **Option A: Fungi**:
- Fungi are eukaryotic organisms. However, they are heterotrophic and do not perform photosynthesis, so they do not have plastids.
- **Option B: Bacteria**:
- Bacteria are prokaryotic organisms. Since plastids are characteristic of eukaryotes, they are not found in bacteria.
- **Option C: Blue-green algae (Cyanobacteria)**:
- Despite the name "algae," blue-green algae are actually prokaryotic (cyanobacteria). They can perform photosynthesis but do not have plastids since they are prokaryotes.
- **Option D: All of these**:
- Since plastids are not found in fungi (eukaryotic), bacteria (prokaryotic), and blue-green algae (prokaryotic), this option is correct.

4. **Conclusion**:
- Plastids are not found in fungi, bacteria, or blue-green algae. Therefore, the correct answer is **D: All of these**.

### Final Answer:
Plastids are not found in **D: All of these**.