C3 and C4 plants

In terms of CO2 compensation point C3 has higher compensation point than C4. CO2 compensation (CP) point is the CO2 concentration where photosynthesis rate is 0. Meaning if plants have CP = 50 plant will start to suffer when CO2 CONCENTRATION is below or equal to 50 meaning they start to starve and die. On the other hand, C4 plant have less than 10 CP meaning they are still surviving even at very low CO2 CONCENTRATION. Also 13carbon isotope ratio of C3 and C4 is different C3 has lower range than C4. Usually -12 to -10 per mil. for C4 and C3 has lower -14 per mil.