Photorespiration involves oxidation of

Options

A. Chlorophyll a
B. PGA
C. RuBP
D. Both B and C.

Answer

To answer the question "Photorespiration involves oxidation of," we need to analyze the options provided and understand the process of photorespiration.

### Step-by-Step Solution:

1. **Understanding Photorespiration**:
- Photorespiration is a process that occurs primarily in C3 plants when the enzyme ribulose-1,5-bisphosphate carboxylase/oxygenase (Rubisco) reacts with oxygen instead of carbon dioxide.

2. **Identifying the Key Components**:
- The main substrates involved in photorespiration are ribulose bisphosphate (RUBP) and phosphoglycolate (PGA).
- RUBP is a 5-carbon sugar that is carboxylated to form two molecules of 3-phosphoglycerate (3-PGA) during normal photosynthesis.
- In the presence of oxygen, RUBP is oxidized to form PGA.

3. **Analyzing the Options**:
- **Option A: Chlorophyll A** - This is not involved in photorespiration as it is a pigment used in photosynthesis.
- **Option B: PGA (Phosphoglycolate)** - This is a product of the oxidation process during photorespiration.
- **Option C: RUBP (Ribulose bisphosphate)** - This is also involved as it is the substrate that gets oxidized in the process.
- **Option D: Both B and C** - Since both PGA and RUBP are involved in photorespiration, this option is correct.

4. **Conclusion**:
- The correct answer is **Option D: Both B and C**. Photorespiration involves the oxidation of both RUBP and PGA.

### Final Answer:
Photorespiration involves oxidation of both B (PGA) and C (RUBP).

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