Halophytic green alga Dunaliella stores

Options

A. Glycerol
B. Sorbitol
C. Proline
D. None of the above.

Answer

### Step-by-Step Solution:

1. **Understanding the Organism**: The question refers to the halophytic green alga Dunaliella. It is important to know that halophytic organisms thrive in high-salinity environments.

2. **Identifying Storage Compounds**: The question asks what Dunaliella stores. Common storage compounds in algae include glycerol, sorbitol, and proline.

3. **Researching Dunaliella**: Dunaliella is known for its ability to survive in extreme saline conditions. It is important to recognize that it has adaptations to cope with osmotic stress.

4. **Analyzing the Options**:
- **A. Glycerol**: Glycerol is known to be a compatible solute that helps in osmoregulation.
- **B. Sorbitol**: While sorbitol is a sugar alcohol, it is not the primary storage compound for Dunaliella.
- **C. Proline**: Proline is an amino acid that can also function as an osmoprotectant but is not the main storage compound.
- **D. None of the above**: This option suggests that none of the listed compounds are stored, which is incorrect based on known information.

5. **Conclusion**: Based on the research and understanding of Dunaliella, it is concluded that the primary compound stored by Dunaliella is glycerol.

6. **Final Answer**: The correct answer is **A. Glycerol**.