Plant water relation; Chapter 9
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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"
-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)
- 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
-move water and nutrients across cell membrane
-from higher and lower concentration
-water moves between cells in intercellular spaces between the cell walls
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
(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
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