Gas vacuoles are not reported in

Options

A. Cyanobacteria
B. Purple/green photosynthetic bacteria
C. Amoeba
D. Prokaryotes

Answer

**Step-by-Step Solution:**

1. **Understanding Gas Vacuoles**: Gas vacuoles are specialized structures found in certain microorganisms, primarily prokaryotes. They help these organisms maintain buoyancy, allowing them to float in aquatic environments.

2. **Identifying Organisms with Gas Vacuoles**:
- **Cyanobacteria**: These are photosynthetic prokaryotes that contain gas vacuoles. They are known to utilize these vacuoles for buoyancy.
- **Purple-Green Photosynthetic Bacteria**: Similar to cyanobacteria, these are also prokaryotic organisms that possess gas vacuoles for buoyancy.

3. **Examining the Third Option - Amoeba**:
- **Amoeba**: This is a eukaryotic organism, not a prokaryote. Amoebas do not have gas vacuoles; instead, they possess contractile vacuoles, which help in osmoregulation (maintaining water balance) rather than buoyancy.

4. **Conclusion**: Based on the analysis, gas vacuoles are not found in Amoeba. Therefore, the correct answer to the question "Gas vacuoles are not reported in" is **Amoeba**.

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