Today's
Learning Objective(s):
Explain how osmoregulatory mechanisms contribute to
the health and survival of organisms.
Tasks:
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1 |
More sample water potential problems
Let’s try a few water potential (Ψ) problems:
a)
An AP biology student
is experimenting with water potential using artificial plant cells. She would
like to cause an increase in the solute potential (Ψs) of the solution.
Which factor would cause that to happen? a.
Increasing temperature b.
Lowering the ionization
constant c.
Increasing solute
concentration d.
nothing will change
the concentration
b)
What is the water
potential (Ψ) of a sucrose solution at 25°C with a solute concentration of
0.2 M, and open to the atmosphere? If this was placed in a container with root
tissue with a water potential (Ψ) of -0.49 bars, how would the water flow?
c)
If a plant cell has
a water potential of -0.6 bars and is placed in a solution of 0.1M NaCl at
20°C, how would the water flow?
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Lab:
Osmosis (part 2) day 2 Think About It... Why are we only using plant cells for the water potential problems and labs? Using
the solutions in the lab (0.0M → 1.0M and X Mystery), place pre-massed cubes
of carrots into cups. You will use the solutions to determine the water
potential of the carrot cells.
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3 |
More Water Potential Problems - Worksheet
Use the worksheet to try some water potential
problems.
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4 |
Quiz: Plasma
Membrane Corrections
Let’s
pass back the quizzes with 20 minutes of the class remaining. Review your
answers. Make corrections. |
Homework
Tuesday, 10/21/25 Quiz:
Cell Transport
Upcoming
Assessments
Tuesday, 10/21/25 Quiz: Cell Transport
Friday, 10/24/25 Test: Cells (unit 2)
Calendar Notes
Thursday, 10/30/25 Q1 Grading
Period Ends
