Explain how the transport of molecules such as sucrose can be coupled to the activity of an ion exchange pump

Coupled transport is also known as co-transport. Plant cells use the hydrogen gradient created by proton pumps to actively transport nutrients to the cells. Electrogenic pumps can be coupled to actively transport other substances. Example - cells pump H + ions out of cell then use the diffusion of H + back into cell down its gradient to drive the uptake of sucrose into cells.