Difference between C3, and C4 plant
| C3 pathway | C4 pathway | |
| 1 | Photosynthesis occurs in mesophyll cells | Photosynthesis occurs in mesophyll cells and bundle sheath cells |
| 2 | The CO2 molecule acceptor is RuBP | The CO2 acceptor molecule is phosphenol pyruvate |
| 3 | The first stable product is a 3C compound Called Glycerate-3-phosphate (PGA) | The first stable product is a 4C compound oxaloacetic acid (OAA) |
| 4 | Photorespiration rate is high and leads to loss of fixed CO2. Decrease CO2 fixation rate | Photorespiration is negligible and is almost absent. Hence high CO2 fixation rate |
| 5 | Optimum temperature is 200C to 250C | Optimum temperature is 30 to 450C. |
| 6 | Photosynthetic rate is low | Photosynthetic rate is high |
| 7. | Examples of C3 plants are rice, wheat and tomato | Examples of C4 plants are maize, sugar cane |
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Dr. Bbosa Science
CATEGORIES General
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