`P_(680)` is calld PS II
! C-4 plants hav photorespiration.

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

To solve the question regarding the assertion and reason provided, we will break it down step by step.

### Step-by-Step Solution:

1. **Understanding the Assertion**:
- The assertion states that "P680 is called PS II."
- P680 refers to a specific pigment that absorbs light at a wavelength of 680 nm, and it is indeed associated with Photosystem II (PS II) in the process of photosynthesis.

2. **Evaluating the Assertion**:
- Since P680 is correctly identified as PS II, we can conclude that the assertion is **true**.

3. **Understanding the Reason**:
- The reason states that "C4 plants have photorespiration."
- Photorespiration is a process that occurs in plants, primarily in C3 plants, where oxygen is taken up and carbon dioxide is released, leading to a decrease in photosynthetic efficiency.

4. **Evaluating the Reason**:
- C4 plants, on the other hand, are adapted to minimize photorespiration. They have a unique anatomy (Kranz anatomy) and biochemical pathway that allows them to efficiently fix carbon dioxide and reduce the occurrence of photorespiration.
- Therefore, the statement that "C4 plants have photorespiration" is **false**.

5. **Conclusion**:
- Since the assertion is true and the reason is false, we can conclude that the correct answer is **Option 3**: "Assertion is correct, reason is wrong."

### Final Answer:
The correct answer is **Option 3**: Assertion is correct, reason is wrong.

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