Transport in plants
Xylem and phloem
- Xylemwater and mineral ionssupport
- Phloemsucroseamino acids
- Positionroot: centrestem: outer ringleaf: veins
- Xylem structureSupplementlignin wallsno contentsno cross walls
Water uptake
- Root hair cellabsorbs water and ionslarge surface area
- Pathway of waterroot hair cellsroot cortexxylemmesophyll
- Stain investigationstem in dyestain in xylem
Transpiration
- Definitionloss of water vapourfrom leaves
- Mechanismevaporation from mesophylldiffusion through stomata
- Factors increasing ratetemperaturewind speed
- HumiditySupplementmore humid: slower rateless steep gradient
- Leaf structureSupplementair spacesstomata number and size
- Transpiration pullSupplementwater columnattraction between molecules
- WiltingSupplementcells lose turgorleaves droop
TranslocationSupplement
- Moves sucrose, amino acidsSupplementin phloem
- SourceSupplementreleases sucrosee.g. mature leaf
- SinkSupplementuses or storese.g. fruit, root tip
- Source and sink at different timesSupplementtuber stores then releases