alleryHow do C4 plants minimise RuBisCO oxygenase activity?
AThey remove RuBisCO from all leaf cells
BThey release CO2 near bundle-sheath RuBisCO
CThey stop ATP synthesis in the light
DThey replace the Calvin cycle with glycolysis
Answer & Solution
Correct answer: B. They release CO2 near bundle-sheath RuBisCO
C4 acids release CO2 in bundle-sheath cells. The high local CO2 concentration favours RuBisCO carboxylation and minimises oxygenation and photorespiration.
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