Q31 / 200 · NEET 2006 · Botany

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

  • A
    stroma of chloroplasts
  • B
    stroma of chloroplasts and mitochondria
  • Correct answer
    C
    stroma of chloroplasts and peroxisomes
  • D
    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.

Hence, the correct answer is option: 'C'.

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