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In C4 plants, decarboxylation of malate or aspartate in bundle sheath cells
ASplits water to release O2 in the lumen
BReleases CO2 near RuBisCO, suppressing photorespiration
CReleases O2 near RuBisCO, enhancing photorespiration
DGenerates ATP for the Calvin cycle in stroma
Answer & Solution
Correct answer: B. Releases CO2 near RuBisCO, suppressing photorespiration
Malate/aspartate from mesophyll is decarboxylated in bundle sheath cells, raising CO2 concentration at RuBisCO. Pyruvate is shipped back to mesophyll for regeneration to PEP. The CO2 pump suppresses photorespiration even at high temperatures.
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