umuc biol103 Lab 7: Ecological Interactions latest 2015 november

QUESTION

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UMUC Biology 102/103
Lab7:Ecological Interactions
INSTRUCTIONS: ·
On your own and without assistance, complete
thisLab
7AnswerSheet electronically
and submit it via theAssignments
Folder by the date listedintheCourse Schedule (underSyllabus).·
To conduct your laboratory exercises, use the
Laboratory Manuallocated 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 Lab7AnswerSheet in the following format: LastName_Lab7 (e.g., Smith_Lab7).·
You should submit your documentas a Word (.doc or .docx) or Rich
Text Format (.rtf) file for best compatibility.

Pre-Lab Questions1.
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
GerminationData Tables and Post-Lab AssessmentTable 1: pH and % Radish Seed
Germination

Stage/Day Observations

Acetic Acid

Sodium Bicarbonate

Water

Initial
pH

Day
1

Day
2

Day
3

Day
4

Day
5

Day
6

Day
7

Post-Lab Questions1. 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).

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