- A PGA, a 3-carbon compound formed via the Calvin cycle
- B Oxaloacetate (4-carbon compound)
- C Sucrose, synthesized directly within mesophyll cells
- D RuBP, regenerated during the Calvin cycle
Correct answer: B. Oxaloacetate (4-carbon compound)
Explanation: C4 plants first fix CO2 into oxaloacetate (4-carbon) in mesophyll cells via PEP carboxylase, then transfer CO2 to bundle sheath for Calvin cycle.
Concept context
Light reactions, the Calvin cycle, C3/C4/CAM pathways, photorespiration, and factors affecting the rate of photosynthesis. One of the highest-yield NEET chapters.