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Biology - Transpiration and Translocation - Coggle Diagram
Biology - Transpiration and Translocation
Phloem tubes
Structure
columns of elongated living cells
small pores in end walls - cell sap to flow
Substances transported
food substances
dissolved sugars
Where from and to?
from leaves to rest of plant
both directions
TRANSLOCATION
Xylem tubes
Structure
dead cells joined end-end
no end walls
strengthened by lignin
Substances transported
water and mineral ions
Where from and to?
roots to stem and leaves
one direction
TRANSPIRATION
Transpiration
Loss of Water from the Plant
leaves
Process
water evaporates and diffuses
slight shortage of water in leaf
more is drawn up from plant through xylem to replace it
more water is drawn up from plant
constant TRANSPIRATION STREAM
side affect of how leaves are adapted for photosynthesis
Potometer
Transpiration Rate
Factors
Light Intesity
Brighter = faster
stomata close when darker
photosynthesis can’t happen in dark
Temperature
Warmer = faster
warm
particles have more energy to evaporate and diffuse
Humidity
Drier air = faster
humid air has lots of water
not a good conc. grad. for diffusion
Air Movement
Good AM = faster
good air movement blows water vapour away
steep conc. grad. for quick diffusion