Mass Transport in Plants (AQA A-Level Biology): Flashcards
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Practise the cards
10 cards from this deck
Function of root hair cells
Function of root hair cells
Increase surface area for water absorption from soil
Structure of xylem vessels
Structure of xylem vessels
Hollow, thick-walled tubes from roots to leaves
What is transpiration?
What is transpiration?
Evaporation of water from leaf surfaces
Where are stomata mainly located?
Where are stomata mainly located?
Mainly on the undersides of leaves
Cohesion-tension theory explains
Cohesion-tension theory explains
How water moves up xylem under negative pressure
Cohesion in water molecules
Cohesion in water molecules
Water molecules stick together via hydrogen bonds
Tension in xylem vessels
Tension in xylem vessels
Negative pressure that pulls water column upward
Tree trunk diameter during peak transpiration
Tree trunk diameter during peak transpiration
Thinner due to increased tension in xylem vessels
What happens when xylem vessel is broken
What happens when xylem vessel is broken
Air is drawn in, not water out (shows negative pressure)
Energy requirement for water transport
Energy requirement for water transport
Passive process, no metabolic energy needed