Question

Photorespiration:

• A. occurs because oxygen rather than carbon dioxide links to the RuBisCO enzyme in the Calvin cycle.
• B. occurs more in $C _4$ than in $C _3$ plants under identical conditions.
• C. describes the uptake of $CO _2 \&$ the release of oxygen in chloroplasts.
• D. All of the above

Answer 1

Answer: (A)

Light induced $CO _2$ liberation from a $C _2$ compound (glycolic acid) of dark phase is called photorespiration. It occurs in green cells only. It is absent in $C _4$ plants and present in $C _3$ plants. Photorespiration occurs because oxygen rather than carbon dioxide links to the rubisco enzyme in the Calvin cycle. It involves three cell organelles - peroxisomes, chloroplast and mitochondria.