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← Nature & AnimalsWhich outcome limits carbon fixation in desert cacti exposed to high daytime temperatures?
A)Photorespiration consumes fixed carbon molecules✓
B)Enhanced transpiration cools photosynthetic cells
C)Increased RuBP production accelerates CO2 capture
D)C4 pathway efficiently captures limited CO2
💡 Explanation
High temperatures increase photorespiration, where oxygen, rather than CO2, is processed by rubisco in Cacti cells; because this consumes pre-fixed carbon, therefore limiting overall carbon fixation during the day, rather than enabling more efficient carbon capture.
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