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Plant water relation; Chapter 9
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Osmosis
ability of water to move through the membrane.
*water inside cells makes it turgid
*lose/gain water across cell membrane and vacuole
*cell wall remains the same "up to a point"
Plasmolysis
-specialized osmosis in plant cells
-water loss causes plants to become "flaccid or wilted"
(3) Route of water
1. Soil > Diffusion> Root
2. Epidermis> Endodermis> Xylem
* 3 types
3. Root > stem > leaf > air
* cohesion-tension theory
(route of water) Soil > Diffusion > Root
Soil (outside of root) > Diffusion > Root (epidermis/root hairs)
Diffusion
movement of water from higher to lower concentration
*reaches equilibrium eventually
(route of water) Epidermis (root hair) > Endodermis > Xylem
*Outside of root to the Center of the root*
-either by symplasty or apoplasty
Symplasty
-move water and nutrients across cell membrane
-from higher and lower concentration
Apoplasty
-water moves between cells in intercellular spaces between the cell walls
*faster method
Endodermis > Symplasty > Xylem
-
endodermis
regulates what goes into the xylem
-
caspirian strip
causes all material to move into cells by symplasty
Root > Stem > Leaf > Air
(moves via xylem) > ( moves out of stomata and guard cells)
by the cohesion-tension theory
3 elements Cohesion-tension theory
-transpiration pull
-cohesion
-adhesion
(Cohesion-tension theory) Transpiration pull
-pulls water up plant from leaves
-major force moving water up a plant
-transpiration: loss of water from leaves via stomatas of guard cell.
(Cohesion-tension theory) Cohesion
-ability of water to "stick to itself"
(Cohesion-tension theory) Adhesion
ability of water to stick to other materials
*explains how water moves up a tube or pipe
Author
efrain12
ID
133318
Card Set
Plant water relation; Chapter 9
Description
day 6
Updated
2/7/2012, 1:40:32 AM
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