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Which constraint arises when a plant maintains high Rubisco concentrations?

A)Increased photorespiration under high oxygen
B)Decreased ATP production in the calvin cycle
C)Reduced starch synthesis during the night
D)Lowered chlorophyll production during daytime

💡 Explanation

Maintaining high Rubisco concentrations elevates oxygen affinity, and the mechanism of photorespiration increases because Rubisco binds to more oxygen. This leads to carbon loss rather than efficient fixation; therefore, photorespiration increases, rather than ATP production falling.

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