During photorespiration, the oxygen consuming reaction (s) occur in:

The first reaction of photorespiration occurs in the stroma of chloroplasts. In this reaction, $\mathrm{RuBisCO}$ in the presence of oxygen shows oxygenase activity. In peroxisomes, the glycolate transferred from chloroplasts takes up $\mathrm{O}_2$ and forms the glyoxylate, whereas $\mathrm{H}_2 \mathrm{O}_2$ is released as a byproduct.