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2.6 describe current theories about processes responsible for the movement of materials through plants in xylem and phloem tissue

describe current theories about processes responsible for the movement of materials through plants in xylem and phloem tissue

Background

From your Preliminary course, you should recall that the transport system in plants involves phloem and xylem. Xylem transports water and mineral ions upward only, from roots toward leaves. Phloem transports organic materials, in particular sugars, up and down to where the material is needed or for storage.