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Vascular Transport

SBI3U PLANTS
by

Thea Stavropoulos

on 13 October 2015

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Transcript of Vascular Transport

Vascular
Transport

Transport in the Xylem
DIFFUSION
net movement of molecules from HIGH TO LOW concentration
continues until
equilibrium
reached
OSMOSIS
diffusion of water across a membrane
HIGH TO LOW concentration
ACTIVE TRANSPORT
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 (+)
minerals
actively transported
into xylem --> large concentration of dissolved minerals --> water enters
positive pressure
pushes

water & minerals

up
through stem, to leaves
Transpirational Pull (-)
moves water and minerals
water lost through leaves & creates negative pressure in xylem
water is
pulled
up to leaves
Translocation
move nutrients from leaves (
source
) to areas where energy is required (
sink
)
Pressure Flow
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
Transpiration
water evaporation from leaves through the stomata
Cohesion-Tension Model
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
Transpiration Experiment
Observations:
-3-5 observations about the materials being used

Hypothesis:
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)
Full transcript