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Transport Processes - Coggle Diagram
Transport Processes
Short- distance transport
Guard cells
Shrunken when stomata are closed
Motor cells
"Joints" allowing plant to reorient itself
Transfer cells
Involved in rapid transfer of material
Water potential
The free energy of water
Can be increased several ways
Put under pressure
Elevsted
Heated
Has 3 components
Osmotic potential
The effect that solutes have on water potential
Matric potential
Water's adhesion to nondissolved structures
Pressure potential
The effect that pressure has on water potential
Long-distance transport
Phloem
Exact mechanism unknown
Most evidence points toward pressure flow hypothesis
Flow in phloem is due to loading in sources and unloading in sinks
Xylem
Cohesion-tension hypothesis widely accepted
As water is pulled upward by transpiration, its molecules cohere to withstand the tension
Diffusion, osmosis, & active transport
Osmosis is diffusion through a membrane
Completely impermeable membranes
Allow nothing to pass through
Freely permeable membranes
Allow all solutes to diffuse
Selectively permeable membranes
Allow only certain substances to pass through
Diffusion is random movement of particles from high to low concentration
