Write the same of two unicellular algae awhich are rich in proteins and are used as food supplements:-

Answer

**Step-by-Step Solution:**

1. **Understanding the Question**: The question asks for two unicellular algae that are rich in proteins and used as food supplements.

2. **Identifying Unicellular Algae**: We need to focus on unicellular algae, which are single-celled organisms.

3. **Listing Potential Candidates**: From the knowledge of algae, we can identify several types. However, we need to filter out the unicellular ones. The candidates mentioned include:
- Chlorella
- Spirulina
- Blue Green Alga (also known as Cyanobacteria)

4. **Confirming Protein Content**: Both Chlorella and Spirulina are known for their high protein content, making them suitable for use as food supplements.

5. **Final Answer**: The two unicellular algae that are rich in proteins and used as food supplements are:
- **Chlorella**
- **Spirulina**