a. A plant cell was placed into water that have Ys = 0 MPa. The plant...
a. A plant cell was placed into water that have Ys = 0 MPa. The plant cell’s Ys = -0.8 MPa and Yp = +0.6 MPa. Discuss where water will move and how the cell’s Ys and Yp will change with the movement of water. At equilibrium, what would happen if you add salt to the water? Explain.
b. How does water move from roots to shoots? Discuss the three mechanisms.
Homework Answers
1. Water potential of pure water =
0
The solute potential of the cell = -0.8 MPa
Pressure potential of the cell = +0.6 MPa
Water potential of the cell = -0.8+0.6
= -0.2 MPa
Water moves from a region of high water potential to a region of
low water potential.
Water moves from the beaker into the cell = Endosmosis
Due to endosmosis, the solute potential decreases, and pressure
potential increases.
At equilibrium, the water potential in both compartments would
become equal
If you add salt to the water, water potential decreases. As a
result, water comes out of the cell into the beaker =
Exosmosis
2. The movement of water from roots to shoot = Ascent of sap
It is aided by multiple factors.
a. Root pressure
b. Adhesion and cohesion properties of water
c. Transpirational pull
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