Photo-respiratory reactions are operated in

Options

A. Chloroplasts, ribosomes and peroxisomes
B. Chloroplasts, mitrochondria and peroxisomes
C. Mitochndria, peroxisomes and lysosomes
D. Mitochondria, chloroplasts and ribosomes.

Answer

**Step-by-Step Solution:**

1. **Understanding Photorespiration**: Photorespiration is a biochemical process that occurs in plants, particularly under conditions of stress, where oxygen is consumed and carbon dioxide is released.

2. **Location of Photorespiratory Reactions**: The reactions associated with photorespiration primarily occur in three organelles: the chloroplasts, peroxisomes, and mitochondria.

3. **Role of Chloroplasts**: In the chloroplasts, oxygen is utilized to produce a two-carbon compound called glycolate.

4. **Conversion of Glycolate**: The glycolate then enters a series of reactions that take place in the peroxisomes and mitochondria. During these reactions, oxygen is taken up, and carbon is released in the form of carbon dioxide.

5. **Energy Consideration**: It is important to note that photorespiration is considered a wasteful process because it does not produce ATP or NADPH, which are essential energy carriers in the plant.

6. **Conclusion**: Therefore, the correct answer to the question about where photo-respiratory reactions are operated is that they occur in the chloroplasts, peroxisomes, and mitochondria.

**Final Answer**: The photo-respiratory reactions are operated in chloroplasts, peroxisomes, and mitochondria.

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