Assertion : Substrate for photorespiration is glycolate.
Reason : Glycolate acts as a respiratory substrate during during photorespiration as `O_(2)` amount increases during photosynthesis.

Options

A. If both Assertion and Reason are true and Reason is correct explanation of Assertion.
B. If both Assertion and Reason are true but Reason is not a correct explanation of Assertion.
C. If Assertion is true but Reason is false.
D. If both Assertion and Reason are false.

Answer

To analyze the assertion and reason provided in the question, we can break down the explanation step by step:

### Step 1: Understanding Photorespiration
- **Definition**: Photorespiration is a process that occurs in plants, particularly in C3 plants, where oxygen is consumed and carbon dioxide is released, leading to a loss of fixed carbon.
- **Role of Rubisco**: The enzyme Ribulose-1,5-bisphosphate carboxylase/oxygenase (Rubisco) plays a crucial role in this process by catalyzing the reaction between ribulose bisphosphate and oxygen instead of carbon dioxide.

**Hint**: Remember that photorespiration is a wasteful process that occurs when oxygen levels are high and carbon dioxide levels are low.

### Step 2: Identifying the Substrate
- **Assertion Analysis**: The assertion states that the substrate for photorespiration is glycolate. Glycolate is indeed a 2-carbon compound that is produced during the photorespiration process.
- **Glycolate Formation**: During photorespiration, the reaction of Rubisco can lead to the formation of glycolate from ribulose bisphosphate.

**Hint**: Focus on the fact that glycolate is a product of the reaction catalyzed by Rubisco during photorespiration.

### Step 3: Evaluating the Reason
- **Reason Analysis**: The reason states that glycolate acts as a respiratory substrate during photorespiration because the amount of oxygen increases during photosynthesis.
- **Correctness of Reason**: This statement is also true. As photosynthesis occurs, oxygen levels increase, which can lead to the photorespiration process where glycolate is utilized.

**Hint**: Consider how the increase in oxygen during photosynthesis can trigger the photorespiration pathway.

### Step 4: Conclusion on Assertion and Reason
- **Both Statements**: Since both the assertion and reason are true, we need to determine if the reason correctly explains the assertion.
- **Explanation Validity**: The reason does provide a valid context for why glycolate is involved in photorespiration, as it highlights the relationship between increased oxygen levels and the occurrence of photorespiration.

**Hint**: Assess whether the reason logically connects to the assertion and provides a clear explanation.

### Final Answer
Based on the analysis:
- **Both assertion and reason are true, and the reason is a correct explanation of the assertion.**

### Answer Option
- The correct option is: **Both assertion and reason are true, and reason is a correct explanation of assertion.**