Why can your knees get wet If you stand in a puddle?

Match the structure to function Lignin Movement of water out of xylem plasmodesmata Space in middle of xylem pit Movement of cytoplasm between cells Companion cell Strengthens xylem walls Lumen End of sieve tube, allow sap to pass through End plate Cell next to sieve tube

Identify Xylem, Phloem and Cambium

Up water potential gradient Water moves from soil into roots From roots water enters xylem water moves up xylem to leaves Water is evaporated into leaf Lost through transpiration Up water potential gradient

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Cell: Low water potential Soil: High water potential

Why does water enter the root? Water enters through root hair cells Root hair cells absorb minerals by active transport Reduces cell water potential Water enters through root hair cells by osmosis

Water from root hair to xylem Root hair to cortex Cortex to xylem

Apoplast Pathway Water soaks into the cell wall Seeps in spaces between cells Doesn’t enter cell

Symplast Pathway Water enters cell Can move cell to cell by osmosis Via strands of cytoplasm: plasmodesmata

Vacuolar pathway Similar to symplastic pathway Not limited to cytoplasm Can move through vacuoles

Symplast Apoplast Vacuolar Moves via osmosis Moves through cell wall Moves via cytoplasm Water trapped in cellulose cell wall Moves via osmosis Moves via plasmodesmata Moves via plasmodesmata Moves via vacuole

Movement across the root