In photorespiration , release of `CO2` occurs in
(a) Mitochondria
(b) Chloroplast
(c) Peroxisomes
(d) All of these

Options

A. Mitochondria
B. Chloroplast
C. Peroxisomes
D. All of these

Answer

To answer the question regarding where the release of CO2 occurs during photorespiration, we can break down the process step by step:

### Step-by-Step Solution:

1. **Understanding Photorespiration**:
- Photorespiration is a process that occurs in plants when the concentration of oxygen is high and carbon dioxide is low. It is considered a wasteful pathway as it can reduce the efficiency of photosynthesis.

2. **Role of Rubisco**:
- The enzyme Ribulose bisphosphate carboxylase/oxygenase (Rubisco) plays a crucial role in this process. Under low CO2 conditions, Rubisco can bind to oxygen instead of carbon dioxide, leading to the formation of a compound called ribulose bisphosphate (RUBP) oxygenase.

3. **Formation of Byproducts**:
- The binding of Rubisco with oxygen leads to the production of two molecules: 2-phosphoglycolate and 3-phosphoglycerate.

4. **Release of CO2**:
- During the conversion of 2-phosphoglycolate back into usable forms, carbon dioxide is released. This release of CO2 primarily occurs in the mitochondria of the cell.

5. **Identifying the Correct Option**:
- The question provides four options regarding where the release of CO2 occurs during photorespiration:
- (a) Mitochondria
- (b) Chloroplast
- (c) Peroxisomes
- (d) All of these
- Based on the explanation, the release of CO2 occurs specifically in the mitochondria.

6. **Final Answer**:
- Therefore, the correct answer is **(a) Mitochondria**.