Plant Organ System (AQA GCSE Biology): Flashcards
📚Flashcards
Practise the cards
14 cards from this deck
ShowHide
Practise the cards
14 cards from this deck
Translocation
Translocation
Movement of food substances in phloem up or down plant
Transpiration
Transpiration
Loss of water vapour from leaves & stems of plant
Transpiration stream
Transpiration stream
Continuous movement of water through plant via xylem
Effect of increased temperature on transpiration
Effect of increased temperature on transpiration
Increases rate - faster evaporation & more stomata open
Effect of high humidity on transpiration
Effect of high humidity on transpiration
Decreases rate - smaller concentration gradient
Effect of increased wind on transpiration
Effect of increased wind on transpiration
Increases rate - steeper concentration gradient
Effect of increased light intensity on transpiration
Effect of increased light intensity on transpiration
Increases rate - more stomata open
What does a potometer measure?
What does a potometer measure?
Water uptake by plant via bubble movement (indicates transpiration)
Guard cells function
Guard cells function
Open and close stomata
Guard cells shape
Guard cells shape
Kidney-shaped
Guard cells wall structure
Guard cells wall structure
Thin outer walls, thick inner walls
Location of most stomata
Location of most stomata
Bottom of leaf
Why more stomata on leaf bottom?
Why more stomata on leaf bottom?
Minimises water loss (shaded & cooler)
How does water move up xylem?
How does water move up xylem?
Cohesion - water molecules attracted to each other, pulled up