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Nature & Animals

Which outcome occurs when high oxygen concentration outcompetes carbon dioxide binding within C3 photosynthetic pathways?

A)Photorespiration reduces net carbon fixation
B)Chlorophyll synthesis increases by feedback loop
C)Stomatal closure prevents water transpiration
D)Electron transport chain enhances ATP production

💡 Explanation

When oxygen concentration is high, photorespiration occurs because Rubisco binds with O2 instead of CO2, resulting in a loss of fixed carbon. Therefore net carbon fixation decreases, rather than chlorophyll increase, stomatal closure, or enhanced ATP production processes which depend on different biochemical conditions.

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