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UMUC Biology 102/103
Lab 7: Ecological Interactions
INSTRUCTIONS:
·
On your own and without assistance, complete
thisLab
7Answer Sheet electronically
and submit it via theAssignments
Folder by the date listed in theCourse Schedule (underSyllabus).
·
To conduct your laboratory exercises, use the
Laboratory Manual located under Course Content. Read the introduction and the
directions for each exercise/experiment carefully before completing the
exercises/experiments and answering the questions.
·
Save your Lab 7Answer Sheet in the
following format: LastName_Lab7 (e.g.,
Smith_Lab7).
·
You should submit your document as a Word (.doc or .docx) or
Rich Text Format (.rtf) file for best compatibility.
Pre-Lab Questions
1.
Would
you expect endangered species to be more frequently generalists or specialists?
Explain your answer.
2.
How
does temperature affect water availability in an ecosystem?
3.
Choose
a species and describe some adaptations that species developed that allow them
to survive in their native habitat.
Experiment 1: Effects of pH on Radish Seed
Germination
Data Tables and Post-Lab Assessment
Table 1: pH and Radish Seed Germination
Stage/Day Observations
Acetic Acid
Sodium Bicarbonate
Water
Initial
pH
1
0/10-NO CHANGE
4/10-SPROUTED
6/10-SPROUTING
2
1/10-SPROUTED
4/10-NO GROWTH
8/10-2 MORE SPROUTING
3
2/10-SPROUTED NO GROWTH
4/10- NO GROWTH
8/10- GROWING
4
2/10-NO GROWTH
4/10-3 GROWING
8/10- NO CHANGE
5
1/10-ONE DEAD
4/10- 2 GROWING
8/10-GROWING
6
1/10-NO CHANGE
3/10-1 GROWING
8/10-GROWING
7
0/10-ALL SEEDS DEAD
2/10-1 GROWING
0.3 CM
8/10-GRQWING
0.6,0.4,0.2,0.4,0.3,0.2,0.3,0.1CM
Post-Lab Questions
1. Compare
and construct a line graph based on the data from Table 1 in the space below.
Place the day on the x axis, and the number of seeds germinated on the y axis.
Be sure to include a title, label the x and y axes, and provide a legend
describing which line corresponds to each plate (e.g., blue = acetic acid,
green = sodium bicarbonate, etc…).
2. Was
there any noticeable effect on the germination rate of the radish seeds as a
result of the pH? Compare and contrast the growth rate for the control with the
alkaline and acidic solutions.
.
3. According
to your results would you say that the radish has a broad pH tolerance? Why or
why not? Use your data to support your answer.
4. Knowing
that acid rain has a pH of 2 – 3 would you conclude that crop species with a
narrow soil pH range are in trouble? Explain why, or why not, using scientific
reasoning. Is acid rain a problem for plant species and crops?
5. Research
and briefly describe a real world example about how acid rain affect plants. Be
sure to demonstrate how pH contributes to the outcome, and proposed solutions
(if any). Descriptions should be approximately 2 – 3 paragraphs. Include at
least three citations (use APA formatting).