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← Nature & AnimalsWhich outcome limits a submerged aquatic plant's photosynthetic rate?
A)Carbon fixation becomes diffusion-limited✓
B)Photorespiration outpaces true photosynthesis
C)Chlorophyll synthesis undergoes photodegradation
D)ATP production experiences feedback inhibition
💡 Explanation
Efficiency in aquatic photosynthesis is constrained when water limits CO₂ availability; rubisco favors oxygen binding in photorespiration becomes dominant, because external CO₂ concentration governs enzymatic activity. Thus reduced carbon fixation occurs, rather than increased photorespiration, chloroplast decline or altered ATP synthesis.
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