Download Section 2.10 Name:

Section 2.10
Name:
Opening Activity:
Review of Old Information:
Part 1: LAB
Potato and Osmosis
I let several pieces of potato sit in two separate dishes. In one dish the potato was surrounded only by
water. In the other dish the potato was surrounded by a solution of salt water. Using this information,
answer the questions below:
1.
2.
3.
4.
5.
Is the potato in salt water a hypotonic or a hypertonic condition? _________________________
Based on the observations of this potato, was water moving into or out of the cell? ___________
Is the potato surrounded by regular water a hypotonic or hypertonic condition? _______________
Based on the observations of this potato, was water moving into or out of the cell? ___________
In which the condition, the salt water or regular water, would plasmolysis occur? ______________
Anacharis and Osmosis
Questions and Predictions:
1. What is the difference between a hypertonic solution and a hypotonic solution?
2. What will happen to plant cells that are placed in a hypertonic solution?
Procedure (already prepared but read)
Obtain two leaves from an elodea plant that is grown in aquarium water. Place one of the leaves on a
slide and observe the cells under a microscope. You should be able to identify the chloroplasts and an
empty space in the middle of the cells which is the vacuole. Soak the other leaf in a salt water solution
and observe the cells under the microscope. Compare the cells to the first slide.
Observations
3. Sketch your slides, showing how the cells appeared in each solution.
4. Analysis: Describe in your own words what happened to the elodea cells.
Part 2: Diffusion and Osmosis Review Across
1. type of transport that requires energy
2. when a solution has a lesser concentration of solute particles
3. type of transport that does not require energy
4. prefix that means "inside" (hint: ________cytosis)
5. movement of molecules from high to low concentration
6. a molecule composed of two hydrogens and one oxygen
7. a solution that has an equal amount of solute particles
8. membranes that let some things through, called selectively ______
9. the maintaining of an internal balance/conditions
10.
word that means "cell"
11.
a difference in concentration creates a concentration _
Down
2. condition achieved when molecules are evenly spread in an area (hint: think equal)
3. when a solution as a greater concentration of solute particles 4. turns color in the presence of starch 5. the engulfing of large particles 7. prefix that means "outside"
9. the diffusion of water 11. DO NOT ANSWER
12. channel/carrier ___ can help move things across the membrane
16. organelle that helps remove excess water; ______ vacuole 18. the outer boundary of the cell