Movement of water/dissolved ions in xylem Flashcards
1
Q
What is cohesion-tension theory
A
Water evaporates
Negative pressure is created (tension)
Mass flow movement begins (transpiration stream)
There is cohesion between water molecules (H bonds)
2
Q
What is root pressure theory
A
Water is moved by ATP from endodermal cells into the xylem cells.
Root pressure is created as a result
This helps water move up plant
