Transport In Flowering Plants Flashcards
1
Q
What causes stomata to open/close?
A
CO2 concentration
2
Q
When do stomata close?
A
Night= high CO2 conc
3
Q
When do stomata open?
A
Day= low CO2 conc
4
Q
How does the cohesion tension theory work?
A
1) Water molecules stick together due to H bonding
2) Water forms continuous column
3) Water also adheres to xylem ( cohesive nature of water molecules)
4) transpiration pulls the water column up. Water is under tension
5) This tension is strong enough to pull water up tall trees
5
Q
Who were the two scientists who proposed the cohesion tension theory?
A
Henry Dixon and John Joly
