Final answer:
The difference between bundle sheath cells in C3 and C4 plants is that C3 plants have bundle sheath cells that are not specialized for carbon fixation, while C4 plants have enlarged bundle sheath cells that are specifically adapted for carbon fixation.
Step-by-step explanation:
The difference between bundle sheath cells in C3 and C4 plants is that C3 plants have bundle sheath cells that are not specialized for carbon fixation, while C4 plants have enlarged bundle sheath cells that are specifically adapted for carbon fixation. In C3 plants, the bundle sheath cells are not involved in the Calvin cycle and do not contain the enzyme Rubisco, which is responsible for fixing carbon dioxide. On the other hand, in C4 plants, the bundle sheath cells contain high levels of Rubisco and are responsible for fixing carbon dioxide.