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TRANSPORT IN PLANTS (FACTORS AFFECTING TRANSPIRATION (OTHERS (Occurence of…
TRANSPORT IN PLANTS
ABSORPTION BY ROOTS
Water
by osmosis via cortex cell
Capillary Action
Pressure generated by roots
Minerals
by active transport
casparian strip
selctive uptake of minerals
accumulation in xylem vessels creates a high solute concentration
FACTORS AFFECTING TRANSPIRATION
Light Intensity
Water Supply
Humidity
Wind Speed
OTHERS
Occurence of CAM photosynthesis
Opening and closing of stomata
Seasonal dormancy
Concentration of CO2
Leaf morphology
CARBOHYDRATE
Translocation via phloem
The Ringing Experiment
Using radio-isotope
Using Aphids
TRANSPIRATION
H2O taken by roots is lost at leaves by evaporation
moves up plant via xylem
exits via stomata
OPENING
guard cells are turgid
usually occur at day
CLOSING
guard cells are flaccid
usually occur at night
WILTING
Pros
reduce the rate of transpiration
temporary permanent loss of tugor presure (exessive transpiration)
result in flaccid appearance
dropping and shriveling of soft tissue
causes gaurd cell to become flaccid & closes stomata to conserve water
Cons
rate of photosynthesis is reduced
H2O, sunlight & CO2 become limiting factors
cause of stomata closing and shriveling of leaves
TRANSLOCATION
sink
sugars are consume
source
sugars are manufactured
