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The first stable product of CO₂ fixation in C4 plants is
A3-PGA (3 carbons)
BOAA (oxaloacetate, 4 carbons)
CG3P
DPyruvate
Answer & Solution
Correct answer: B. OAA (oxaloacetate, 4 carbons)
C4 plants fix CO₂ first as OAA, a 4-carbon compound (hence the name). Concentrates CO₂ near RuBisCO in bundle-sheath cells, suppressing photorespiration. C3 plants make 3-PGA directly.
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