Revise: Transport systems - PlantsPhloem transport system

Multicellular organisms require transport systems to supply their cells and remove waste products. Plants transport substances through xylem and phloem.

Part ofBiologyRevision guides: Multicellular organisms

Phloem transport system

Phloem cells. Green seive tubes with end walls and companion cells.

Sugar produced by photosynthesis in the leaves is transported up and down the plant to the meristems and other tissues in living cells.

Companion cells provide the energy for the sieve cells. The end walls of the sieve cells have pores through which sugar is transported from cell to cell.