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Transcript of Vascular Transport
Transport in the Xylem
net movement of molecules from HIGH TO LOW concentration
diffusion of water across a membrane
HIGH TO LOW concentration
requires energy input
moves sugars & nutrients across cell membranes
Xylem moves water and minerals from roots to leaves against gravity.
How might this be possible?
Root Pressure (+)
into xylem --> large concentration of dissolved minerals --> water enters
water & minerals
through stem, to leaves
Transpirational Pull (-)
moves water and minerals
water lost through leaves & creates negative pressure in xylem
up to leaves
move nutrients from leaves (
) to areas where energy is required (
sucrose created, pumped into phloem -> changes concentration -> changes water movement
pressure builds at source, pushing sucrose towards sink
can move nutrients in both directions, sometimes at once
Nutrient Transport in the Phloem
Water Movement Through Plants
water evaporation from leaves through the stomata
1. transpiration --> evaporation
-dry heat, wind
2. cohesion --> attraction between water and xylem
-allows water to move in column
3. adhesion --> water sticks to xylem
-keeps column from breaking
-3-5 observations about the materials being used
What do you think will happen?
Friday, September 25, 2015
Support your hypothesis with what you've learned today.
moves sucrose/nutrients through phloem (osmosis + pressure dynamics)