Mass Transport in plants
- Created by: emma
- Created on: 06-03-14 19:40
View mindmap
- Mass Transport in plants
- Roots
- root pressure
- Active transport of ion by the endodermis
- Ions move into the xylem which lowers water potential in the xylem
- Water enters xylem by osmosis
- Ions move into the xylem which lowers water potential in the xylem
- Active transport of ion by the endodermis
- Have extensions to increase the surface area
- actively transport ions into cytoplasm to lower water potential
- water can enter cytoplasm via osmosis
- actively transport ions into cytoplasm to lower water potential
- Water can flow the symplastic way (through cytoplasm)
- Or apoplastic way (through cell wall)
- Casparian ***** prevents water movement in cell wall of endodermis and is forced into the cytoplasm
- Or apoplastic way (through cell wall)
- root pressure
- Xylem
- Hollow tubes (dead)
- contain lignin which is waterproof
- Pits enables water to move between vessels in case of a blockage
- contain lignin which is waterproof
- Transpiration is evaporation of water through stomata
- Lowers water potential of mesophyll cells in leaf
- Water moves out of xylem via osmosis
- water moving out of xylem creates negative pressure in xylem vessel
- Water moves out of xylem via osmosis
- Lowers water potential of mesophyll cells in leaf
- Water forms a continuous column in narrow xylem vessel
- water molecules stick together (cohesion)
- Water molecules are attracted to walls of xylem
- water molecules stick together (cohesion)
- Hollow tubes (dead)
- Rate of transpiration
- Light
- Stomata open in light and close in dark
- ROT higher in light
- Stomata open in light and close in dark
- Temperature
- Increased temperature increases ROT
- Rate of diffusion increase as molecules have more energy
- Increased temperature increases ROT
- Humidity
- Air spaces in leaf saturated
- Air out of leaf much less water vapour
- Large concentration gradient so increased rate of diffusion
- Air out of leaf much less water vapour
- Air spaces in leaf saturated
- Air movement
- Moves water vapour away from stomata
- Increases water potential gradient between inside and outside of leaf
- More diffusion so increase ROT
- Increases water potential gradient between inside and outside of leaf
- Moves water vapour away from stomata
- Light
- Potometer
- Leaf shoot cut under water
- Potometer filled with water
- Leafy shoot fitted to potometer under water
- Potometer sealed with jelly
- An air bubble is introduced into tube
- As transpiration occurs water moves through the capillary
- Roots
- water can enter cytoplasm via osmosis
Comments
No comments have yet been made