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Chapter 12 - Transport Process (3 types of membranes (Freely permeable,…
Chapter 12 - Transport Process
Plants have a few basic types of transport processes
Short distance
connected by plasmodesmata
fine cytoplasmic channels that pass through primary cell walls
Symplast - one big mass of protoplasm
Long distance
moved through the phloem
pressure flow hypothesis
membrane bound molecular pumps and active transport
sources- water and nutrients are transported
sugar actively transported into sieves
diffuse into conducting cells
polymerized into polysaccharides
phloem is loaded by the polymer trap mechanism
sinks
sites that receive phloem sap
Xylem
cohesive
adhesive
early mornings
stomata are closed
How materials move through a solution and crosses membrane
diffusion
random movement of particles
high concentration to low concentration
*Osmosis
3 types of membranes
Freely permeable
allow all solutes to pass through
Completely impermeable
Do not allow anything to pass through
Selectively permeable
only allow certain substances to pass
have membrane bound molecules
use ATP to force molecules across membrane
active transport
Endoplasmic reticulum & dictysome membranes
transport material that accumulate in vesicles
intracellular transport
vesicles migrate through cytoplasm
merge and transferred into organelle
