Assertion: Red colour of rhodophyta is due to abundant formation of r-phycoerythrin.
Reason: r-Phycoerythrin is able to absorb blue green wavelength of light and reflect red colour.

Options

A. If both assertion and reason are true and reason is the correct explanation of assertion.
B. if both assertion and reason are true but reason is not the correct explanation of assertion
C. if assertion is true but reason is false.
D. if both assertion and reason are false.

Explanation

To solve the question, we need to analyze both the assertion and the reason provided.

### Step-by-Step Solution:

1. **Understanding the Assertion**:
- The assertion states that the red color of Rhodophyta (red algae) is due to the abundant formation of r-phycoerythrin.
- **Explanation**: Rhodophyta contains a pigment called r-phycoerythrin, which is responsible for its characteristic red color.

2. **Understanding the Reason**:
- The reason given is that r-phycoerythrin absorbs blue-green wavelengths of light and reflects red color.
- **Explanation**: This pigment has the ability to absorb specific wavelengths of light (blue-green) and reflect others (red), which is why red algae appear red.

3. **Evaluating the Truth of the Statements**:
- Both the assertion and the reason are true statements.
- The assertion correctly identifies the pigment responsible for the red color in Rhodophyta, and the reason accurately describes the function of r-phycoerythrin.

4. **Determining the Relationship**:
- The reason provided explains why the assertion is true. Since r-phycoerythrin is responsible for the red color by absorbing blue-green light and reflecting red, it serves as a correct explanation for the assertion.

5. **Conclusion**:
- Since both the assertion and reason are true, and the reason correctly explains the assertion, the correct answer is that both statements are true and the reason is the correct explanation for the assertion.

### Final Answer:
Both the assertion and reason are true, and the reason is the correct explanation for the assertion.