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# Climate Change and its Impact on C3 vs. C4 Photosynthesis

BIOCHM-SC$JBZ As global climate change brings about higher temperatures and concentrations of atmospheric${ CO }_{ 2 }$, which one of the following is NOT likely to be observed in plant responses? A The productivity of C3 plants is likely to increase due to the higher concentrations of${ CO }_{ 2 }$better out-competing${ O }_{ 2 }$for binding to RuBisCO (ribulose 1,5-bisphosphate carboxylase/oxygenase). B The productivity of C4 plants is likely to increase due to the higher concentrations of${ CO }_{ 2 }$better out-competing${ O }_{ 2 }$for binding to RuBisCO (ribulose 1,5-bisphosphate carboxylase/oxygenase). C The productivity of C4 plants is likely not to improve since they do not exhibit photorespiration and have a greater energy demand than C3 plants. D The productivity of C3 plants will be tempered by the higher temperatures due to RuBisCO having a lower temperature optimum (compared to the C4 pathway enzyme phosphoenolpyruvate carboxylase and the greater demand for water by C3 plants. E The productivity of CAM plants will increase since they will benefit from higher concentrations of${ CO }_{ 2 }\$ and they are adapted to live in environments with high temperatures and low water availability.