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Nature & Animals

Which metabolic consequence occurs when internal CO2 concentration decreases within photosynthetic bundle sheath cells using the C4 pathway?

A)Photorespiration increases, reducing photosynthetic efficiency
B)PEP carboxylase activity directly accelerates rapidly
C)Rubisco is directly inhibited competitively by O2
D)Stomata quickly close, maximizing CO2 absorbance

💡 Explanation

Decreased CO2 causes increased photorespiration because RUBISCO binds O2 rather than CO2, therefore reducing the efficiency of photosynthesis. The C4 pathway minimizes photorespiration under normal conditions, rather than directly affecting stomata.

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