State four physiological differences between C3 and C4 plants.
| C3 plants | C4 plants |
| Carbon dioxide acceptor is RUBP | Carbon dioxide acceptor is PEP |
| First stable product is PGA | First stable product is Oxaloacetic acid (OAA). |
| Photorespiration occurs | Photorespiration does not occur. |
| Requires 18 ATP for the synthesis of one glucose molecule | Require 30 ATP for the synthesis of one glucose molecule. |