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stems, Stems have Vascular Bundles, Vascular Bundles have Xylem (closest to center), sugar into sieve tubes by creating a proton gradient (cotransport of sugar and protons); water follows at sink sugar is unloaded; water follows, water is pulled up as transpiration occurs water goes soil -> roots (symplast or apoplast) -> xylem -> leaf -> mesophyll -> atmosphere, Pressure-Flow Hypothesis (sugars) where sugar is translocated, Vascular Cambium produces Secondary Xylem (wood), Stems function in transport, Stems have Pith, Pith in dicots, Cortex in dicots