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← Nature & AnimalsWhich outcome results when oxygen concentration increases significantly within C3 plant chloroplast cells?
A)Photorespiration dominates, reducing carbon fixation✓
B)Rubisco selectivity shifts to carbon molecules
C)Stomata open more, enhancing CO2 intake
D)Chlorophyll synthesis increases compensating oxygen
💡 Explanation
When oxygen concentration increases significantly within chloroplasts, photorespiration dominates because rubisco binds to oxygen instead of carbon dioxide, leading to decreased carbon fixation. Therefore photorespiration increase correctly results, rather than increased rubisco selectivity, stomata opening, or chlorophyll synthesis requiring alternative conditions.
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