During photorespiration, the oxygen consuming reaction (s) occur in:
During photorespiration, the oxygen consuming reaction (s) occur in:
stroma of chloroplasts
stroma of chloroplasts and mitochondria
stroma of chloroplasts and peroxisomes
grana of chloroplasts and peroxisomes
Solution
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.