Answer: Phosphoenolpyruvate.
- A Ribulose bisphosphate
- B Oxaloacetic acid
- C Phosphoenolpyruvate
- D Glyceraldehyde phosphate
Correct answer: C. Phosphoenolpyruvate
Explanation: In C4 mesophyll cells, PEP (phosphoenolpyruvate) accepts CO2 to form the 4-carbon oxaloacetate.
Simplified photosynthesis diagram: light energy, CO2, and H2O enter the leaf and are converted in the chloroplast into glucose and O2.
Concept context
Light reactions, the Calvin cycle, C 3 /C 4 /CAM pathways, photorespiration, and factors affecting the rate of photosynthesis. One of the highest-yield NEET chapters.