What is photorespiration?
GeneralClass 12AllAnswered 27 Mar 2026
Answer
Photorespiration is the light-dependent uptake of O₂ and release of CO₂ that occurs when RuBisCO's oxygenase activity dominates over carboxylase activity. This wasteful process:
- Occurs primarily in C3 plants
- Results in 25% loss of fixed carbon
- Involves three organelles: chloroplasts, peroxisomes, and mitochondria
- Does not produce ATP or NADPH
- Increases with high O₂/CO₂ ratios and elevated temperatures
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