L3_key_1106S19.docx - BIOL 1106 Classwork Spring 2019...

BIOL 1106 Classwork Spring 2019
Lesson 3: Transport Through the Pl ant Body (20 points) – Key
This graded assignment is subject to the Virginia Tech Honor Code. Sharing or posting any content
from this assignment, or using such shared or posted assignment content to answer assignment
questions, is a violation of the Virginia Tech Honor Code.
Names and emails:
1.
2.
3.
Lesson Objectives:
1. Calculate the water potential of a cell and predict the direction of water movement based on
water potential.
3. Explain the cohesion-tension theory of water transport in the xylem.
4. Describe the mechanism of stomatal opening and closing
5. Explain the pressure-flow hypothesis of fluid transport in the phloem.
S1. Apply scientific reasoning to biological problems
S3. Interpret and draw conclusions from scientific data
S4. Apply basic quantitative methods to biological problems
Part I: Water Potential
(3.5 pts; 0.5 pts per cell) Fill in the missing data in the table and predict the direction of water movement
based on water potentials.
Solute
potential of
cell
Pressure
potential of
cell
Water
potential of
cell
Solute
potential of
solution into
which the
cell is placed
(in an open
container)
Direction of
water movement
(into or out of
cell, or no net
movement?)
-0.7 MPa 0 MPa 1. -0.7 MPa -0.9 MPa 2. out of cell
-0.7 MPa 0 MPa -0.7 MPa 0 MPa 3. into cell
-0.35 MPa 0.2 MPa 4. -0.15 -0.15 MPa 5. no net
movement
-0.1 MPa 6. 0.05 MPa -0.05 MPa -0.1 MPa 7. out of cell
This graded assignment is subject to the Virginia Tech Honor Code. Sharing or posting any content