Transport in the xylem of the plant
- Created by: lavithedemon
- Created on: 10-04-16 16:00
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- Transport in the xylem of the plant
- Transpiration is the inevitable consequence of gas exchange in the leaf
- loss of water vapour
- guard cells - control the aperture of the stoma and can adjust from wide open to fully closed
- exception - liverworts
- guard cells - control the aperture of the stoma and can adjust from wide open to fully closed
- loss of water vapour
- the cohesive property of water and the structure of the xylem vessels allow transport under tension
- lignin - strenghten the walls of the xylem
- pressure much lower than atmospheric one
- water molecules are polar
- cohesion between molecules
- attraction to hydrophilic parts of the xylem
- adhesion
- water can be pulled up
- cohesion between molecules
- water can be pulled up
- adhesion
- lignin - strenghten the walls of the xylem
- the adhesive property of water and evaporation generate tension forces in leaf cell walls
- to replace water evaporated
- from the xylem vessels
- the force of adhesion between water and cell walls is strong enough to **** water out of the xylem
- low pressure
- pulling force - transpiration pull
- low pressure
- to replace water evaporated
- active uptake of mineral ions in the roots causes absorption of water by osmosis
- the solute concentration in the root cells is greater than the one in the soil
- mineral ions are taken by active transport
- Plants transport water from roots to leaves to replace losses from transpiration
- apoplast pathway - water moves through cell walls
- symplast pathway - water moves through cytoplasm
- Transpiration is the inevitable consequence of gas exchange in the leaf
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