Answer: CO 2 fixation: CO 2 + RuBP → 2 PGA.
- A ATP synthesis
- B CO<sub>2</sub> fixation: CO<sub>2</sub> + RuBP → 2 PGA
- C Sugar to starch conversion
- D Electron transfer
Correct answer: B. CO<sub>2</sub> fixation: CO<sub>2</sub> + RuBP → 2 PGA
Explanation: Rubisco (RuBisCO = ribulose bisphosphate carboxylase/oxygenase) catalyzes fixation of CO<sub>2</sub> onto RuBP to form 2 molecules of 3-PGA.
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.