Download - AP Environmental Science Mr. Grant Lesson 66
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AP Environmental Science
Mr. Grant
Lesson 66
Lab: Soil Salinization
Part 2
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Objectives:
• Students will conduct an experiment to investigate how salinization affects germination of crop seeds, then determine at what salt concentration seeds no longer germinate.
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APES - Salinization Lab
Purpose
To involve students in a real world scientific investigation in which they design an experiment to determine how the concentration of salt in water affects the germination rate of seeds.
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APES - Salinization Lab
What to turn in:
Hypothesis
Data Table
Graphs 1 & 2
Analysis Questions #1-10
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APES - Salinization Lab
APES - Salinization Lab Hand-In
Name: ______________________________________________________________
Hypothesis:
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APES - Salinization LabSALINIZATION LAB DATA TABLE
DATA TABLE 1: DAILY LOG
Observation Number Date Label Number of Seeds
Germinated Number of Seeds with
No Growth Comments
1 Control 1.0 2.0 3.0 4.1 4.2 4.4 5.0
2 Control 1.0 2.0 3.0 4.1 4.2 4.4 5.0
3 Control 1.0 2.0 3.0 4.1 4.2 4.4 5.0
4 Control 1.0 2.0 3.0 4.1 4.2 4.4 5.0
5 Control 1.0
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APES - Salinization Lab
SALINIZATION LAB DATA TABLE DATA TABLE 2: Summary of Results
Label Number of Seeds
Used
Amount of Salt
Solution, ml
Concentration of Salt
Solution
Total Number of
Seeds Germinated
Total Number of Seeds with No growth
% Gernination
Control 0.0
1.0 1.0
2.0 2.0
3.0 3.0
4.1 4.1
4.2 4.2
4.4 4.4
5.0 5.0
© 2011 Pearson Education, Inc.
APES - Salinization Lab
© 2011 Pearson Education, Inc.
APES - Salinization LabAnalysis Questions
1) What is the control group in this experiment?
2) What is the dependent variable in this experiment?
3) What is the independent variable in this experiment?
4) Does there seem to be a relationship between the number of seeds which germinated and the concentration of the salt water? If so, what is that relationship?
© 2011 Pearson Education, Inc.
APES - Salinization Lab1) Does there seem to be a relationship between the % that germinated and the concentration
of the salt water? If so, what?
2) Did your experiment support your hypothesis? Explain.
3) Can you think of any errors that might have occurred that would invalidate your experiment? If so what were they and how might they be corrected?
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APES - Salinization Lab
1) Explain why increasing levels of salt concentrations affect seed growth and why irrigation seems to be the main cause of this. (Use other sources, if necessary, but cite them.)
2) Do you think all seeds would be affected in similar ways as the ones you used?