Question

Describe the process of phloem unloading and explain how a conc gradient is maintained from the phloem into cells requiring sucrose.

Accepted Answer

Phloem unloading:Sucrose diffuses from phloem into surrounding cells at any point into cells that need itSucrose rapidly moves into other cells by diffusion/converted into another substance so that conc gradient is maintainedLoss of solutes causes rise in water potential of phloem - water moves out into surrounding cells by osmosis, some drawn into transpiration stream

Front	Describe the process of phloem unloading and explain how a conc gradient is maintained from the phloem into cells requiring sucrose.
Back	Phloem unloading: Sucrose diffuses from phloem into surrounding cells at any point into cells that need it Sucrose rapidly moves into other cells by diffusion/converted into another substance so that conc gradient is maintained Loss of solutes causes rise in water potential of phloem - water moves out into surrounding cells by osmosis, some drawn into transpiration stream

Phloem Cells Conc Gradient Maintained Sucrose Surrounding Moves