Assertion : Under conditions of high light intensity and limited `CO_(2)` supply, photorespiration has a useful role in protecting the plants from photo oxidative damage.
Reason If enough `CO_(2)` is not avilable to utilize light enregy for carboxylation to proceed, the excess energy may not cause damage to plants.

Options

A. If both Assertion & Reason are true and the reason is the correct explanation of the assertion.
B. It both Assertion & Reason are true but the reason is not the correct explanation of the assertion.
C. If Assertion is true statement but Reason is false.
D. It both Assertion and Reason are false statements.

Explanation

To solve the question, we need to analyze the assertion and reason provided and determine their validity and relationship.

### Step-by-Step Solution:

1. **Understanding the Assertion**:
- The assertion states that under conditions of high light intensity and limited CO2 supply, photorespiration plays a useful role in protecting plants from photo-oxidative damage.
- Photorespiration is a process that occurs when the enzyme RuBisCO oxygenates ribulose bisphosphate instead of carboxylating it, which can lead to the production of harmful by-products.

2. **Understanding the Reason**:
- The reason given is that if there is not enough CO2 available for carboxylation, the excess light energy may not cause damage to plants.
- This implies that in the absence of sufficient CO2, the plant cannot effectively utilize the light energy for photosynthesis, which could lead to oxidative stress.

3. **Evaluating the Assertion**:
- The assertion is true because photorespiration can indeed help mitigate the effects of excess light energy by dissipating it, thus preventing damage to the plant.

4. **Evaluating the Reason**:
- The reason is also true. When CO2 is limited, the process of carboxylation is inhibited, leading to a situation where excess light energy could potentially cause damage. Photorespiration helps to alleviate this issue.

5. **Determining the Relationship**:
- The reason correctly explains the assertion. When CO2 is limited, photorespiration serves as a protective mechanism against photo-oxidative damage due to excess light energy.

6. **Conclusion**:
- Both the assertion and the reason are true, and the reason is a correct explanation of the assertion. Therefore, the correct answer is that both the assertion and reason are true, and the reason is the correct explanation of the assertion.

### Final Answer:
- **Option 1**: Both assertion and reason are true, and the reason is the correct explanation of the assertion.