Spirulina is a rich source of proteins.
Spirulina has a spiral chloroplasts.

Options

A. If both As and R are correct and R is correct explanation of As
B. If both As and R are correct but R is not correct explanation of As
C. If As is correct, R is wrong
D. If both As and R are wrong.

Answer

### Step-by-Step Solution:

1. **Understanding the Assertion**: The assertion states that "Spirulina is a rich source of proteins."
- **Explanation**: Spirulina is indeed known for its high protein content. It is a type of cyanobacteria (often referred to as blue-green algae) and is widely recognized for its nutritional benefits, particularly its protein content.

2. **Analyzing the Reason**: The reason provided is "Spirulina has spiral chloroplasts."
- **Explanation**: While Spirulina does have chlorophyll and can perform photosynthesis, it does not possess true chloroplasts as found in eukaryotic algae and plants. Instead, Spirulina is prokaryotic and lacks membrane-bound organelles, including true chloroplasts.

3. **Determining the Correctness of the Assertion and Reason**:
- The assertion is **correct** because Spirulina is indeed a rich source of proteins.
- The reason is **incorrect** because Spirulina does not have spiral chloroplasts; it lacks true chloroplasts altogether due to its prokaryotic nature.

4. **Conclusion**: Since the assertion is true and the reason is false, we conclude that the correct relationship is that both statements cannot be true together.

### Final Answer:
- The assertion is correct, but the reason is incorrect.