Based on photosynthesis,C4 plants are more efficient than C3 plants due to following causes:-
- Photorespiration is absent or rare in C4 plants.
- PEP and PEPC have more affinity with CO2 than oxygen.
- C4 plants have low compensation points of CO2 for photosynthesis.
- There are two sites of photosynthesis with two types of chloroplasts.