What gets transported What gets transported throughout the plant?throughout the plant?

WaterWater

MineralsMinerals

SugarSugar

Roots absorb water and Roots absorb water and mineralsminerals

Root hairs and associated fungi Root hairs and associated fungi help help absorb water and minerals from soilabsorb water and minerals from soil

Root pressure Root pressure : Water and minerals : Water and minerals move into the vascular tissue (xylem)move into the vascular tissue (xylem)

Minerals (nutrients) move in by Minerals (nutrients) move in by active active transporttransport

The more minerals that accumulate in The more minerals that accumulate in xylem the more water will enter through xylem the more water will enter through osmosisosmosis

Upward movement of xylem Upward movement of xylem sapsap

Besides root pressure, three other factors Besides root pressure, three other factors are involved in this process:are involved in this process:TranspirationTranspiration – loss of water through – loss of water through evaporation generates the evaporation generates the transpiration pulltranspiration pullCohesionCohesion – water molecules form – water molecules form continuous strings from roots to leavescontinuous strings from roots to leavesAdhesionAdhesion – water molecules stick to – water molecules stick to cellulose molecules in xylem.cellulose molecules in xylem.

TranspirationTranspiration

Transpiration is required for:Transpiration is required for: The upward transport of water and The upward transport of water and

minerals from the roots to the leaves minerals from the roots to the leaves Evaporative cooling Evaporative cooling

Regulating water lossRegulating water loss

Water follows potassium ions from surrounding cells into guard cells

The flow of potassium ions and water out of the guard cells causes them to sag together, closing the stoma

Downward movement of phloem Downward movement of phloem sapsap

From source to sinkFrom source to sink – Phloem moves – Phloem moves sugars from where they are made to sugars from where they are made to where they are usedwhere they are used

What drives movement of phloem sap is What drives movement of phloem sap is the the pressure-flow mechanismpressure-flow mechanism

AnimationsAnimations

http://www.wou.edu/~bledsoek/103materials/prhttp://www.wou.edu/~bledsoek/103materials/presentations/plant_transport.pptesentations/plant_transport.ppt

http://highered.mcgraw-hill.com/sites/98340923http://highered.mcgraw-hill.com/sites/9834092339/student_view0/chapter38/animation_-_wate39/student_view0/chapter38/animation_-_water_uptake.htmlr_uptake.html

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