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Nature & Animals

Which restriction follows from photorespiration occuring due to high oxygen?

A)Reduced effectiveness of C3 pathways
B)Increased efficiency in electron transport
C)Enhanced production rates of NADPH
D)Optimized carbon fixation by C4

💡 Explanation

C3 plants under high O₂ environment undergo photorespiration; rubisco fixes O₂ instead of CO₂. This diversion inhibits the Calvin cycle because it depletes RuBP meant for carbon fixation, therefore reducing the efficiency of the C3 pathway, rather than enhancing it under oxygen-poor conditions.

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