C3 plants | C4 plants |
This pathway takes place in all the plants. | This pathway occurs only in the C4 plants. |
The first stable product is three carbon is PGA. | The first stable product is four carbon is OAA. |
The carboxylase enzyme is RuBisCo. | The carboxylase enzyme is RuBisCo and PEP carboxylase. |
The primary acceptor is RUBP. | The primary acceptor is PEP. |
Kranz anatomy is not present. | Kranz anatomy is present. |
Oxygen has inhibitory effects. | There are no inhibitory effects of oxygen. |
Low concentration of carbon dioxide lowers the efficiency. | The concentration of carbon dioxide will have no effect on the efficiency. |
One molecule of CO2 is fixed which requires 3 ATP and 2 NADH. | One molecule of CO2 is fixed which requires 5 ATP and 3 NADH. |