Peroxisomes

Question

Peroxisomes are involved in which metabolic process in plant cells?

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1. **Photorespiration ($C_2$ Cycle)**: This process occurs in $C_3$ plants under high $O_2$ conditions, involving Chloroplasts, **Peroxisomes**, and Mitochondria.
2. **Peroxisome Role**: In the peroxisome, **glycolate** (imported from chloroplasts) is oxidized by glycolate oxidase to form glyoxylate and **Hydrogen Peroxide ($H_2O_2$)**.
3. **Detoxification**: Peroxisomes contain the enzyme **catalase**, which immediately breaks down the poisonous $H_2O_2$ into water and oxygen.
4. **Significance**: This is a classic example of three-organelle cooperation in plant metabolism.

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Peroxisomes

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