The significances of C4 cycle:
1. Plants having C4 cycle are mainly of tropical and sub – tropical regions and are able to survive in environment with low CO2 concentration.
2. C4 plants are partially adapted to drought conditions.
3. Oxygen has no inhibitory effect on C4 cycle since PEP carboxylase is insensitive to O2.
4. Due to absence of photorespiration, CO2 Compensation Point for C4 is lower than that of C3 plants.
