Worksheet 3
Plasmolysis
25 points
Name:
Section:
Date Turned In:
Introduction:
1. (4 pts) Draw a concept map that includes the following terms: plasmolysis, salt,
water, movement, plant cell membrane, plant cell wall. . Use all of the terms at
least once. Make sure the linking phrases you use are appropriate. Mastering
Biology has a guide to concept mapping.
Materials and Methods:
2a. (2 pts) What method did your group or class use to measure plasmolysis?
2b. (3 pts) Why was it important to decide on the method to use for collecting your
data BEFORE you performed the experiment?
Results:
3. (5 pts) Use Prism to create a bar graph for the following data:
(column A) number or percent of Elodea plasmolysis at minimal
concentration of NaCl,
(column B) number or percent of Elodea plasmolysis at the same
concentration of sucrose,
(column C) number or percent of Algae plasmolysis at the same
concentration of NaCl as in column A.
Make sure to provide an accurate figure legend. Make sure that both the x and y –
axis have appropriate labels.
Graphing and figure legends
There are several important factors to consider when constructing a scientific
graph. First, properly labeling and setting up your graph requires you to
distinguish between dependent and independent variables. Independent variables
are independent of other variables in an experiment. Usually, you control this
variable. Dependent variables are dependent on other variables in an experiment.
Usually, this is the measure you are interested in investigating in an experiment.
Independent variables are always on the x-axis; dependent variables are on the yaxis. Second, data points may or may not be connected; sometimes, a best fit line is
often included to show general trends in the data. Consider this as you graph the
data below:
4a. (5 pts) Use Prism to create an XY-points only graph for the following data.
Number or percent of Elodea cells in plasmolysis based on the Mol. of NaCl
Make sure to provide an accurate figure legend. Make sure that both the x and y –
axis have appropriate labels.
4b. (2 pts) What did you use as your dependent variable? Why?
Discussion:
5. (2 pts) Did sucrose produce the same reaction as sodium chloride? Explain why
or why not.
6. (2 pts) Did the saltwater plant have the same reaction as Elodea? Explain why
or why not.