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Question
Give a comparison between the following:
C3 and C4 pathways
Solution
| C3 pathways | C4 pathways | |
| 1. | Ribulose biphosphate is the initial carbon dioxide acceptor. | The first CO2 acceptor is phosphoenol pyruvate, and the second is ribulose biphosphate. |
| 2. | The first product is phosphoglyceric acid. | This is the first product: oxaloacetic acid. |
| 3. | Only the Calvin cycle is used by the plants. | In addition to the Calvin cycle, plants also have a dicarboxylic acid cycle. |
| 4. | The range of CO2 compensation is 25 - 100 ppm. | The CO2 compensation range is 0 - 10 ppm. |
| 5. | Photosynthesis is completed by Mesophy II cells. | Mesophy II cells are limited to first fixation. |
| 6. | The absorption of carbon occurs slowly. | Assimilation of carbon occurs at a rather quick rate. |
| 7. | Plants cannot carry out photosynthesis when CO2 concentrations are very low, between 10 and 50 parts per million. | Even at very low CO2 concentrations of 10 to 50 ppm, photosynthesis is still occurring. |
| 8. | Every plant has a cycle in place. | Only certain plants, such as sugarcane, maize, and others, exhibit the cycle. |
| 9. | One CO2 molecule requires 3 ATP and 2NADPH to fix. | One CO2 molecule needed 5 ATP and 2NADPH to fix. |
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