UMUC Biology 102/103

Lab 7: Ecology of Organisms

INSTRUCTIONS:

· On your own and without assistance, complete this Lab 7 Answer Form electronically and submit it via the Assignments Folder by the date listed on your Course Schedule (under Syllabus).

· To conduct your laboratory exercises, use the Laboratory Manual that is available in the WebTycho classroom (Reserved Reading or provided by your instructor) or at the eScience Labs Student Portal. Laboratory exercises on your CD may not be updated.

· Save your Lab7AnswerForm in the following format: LastName_Lab7 (e.g., Smith_Lab7).

· You should submit your document in a Word (.doc or .docx) or Rich Text Format (.rtf) for best compatibility.

Experiment 1: Effects of pH on Radish Seed Germination

Table 1: Radish Seed Observation and Germination

Solution	pH	Days 1-2			Day 3			Day 4
		Observation	Seeds Germinated	%	Observation	Seeds Germinated	%	Observation	Seeds Germinated	%
Water
Vinegar
Baking soda

Complete the graph. Use the graph provided as your template. You will need to impose figures and shapes over the graph.

00.20.40.60.811.2Category 1Category 2Category 3

00.20.40.60.811.2Category 1Category 2Category 3

 

Questions

1. 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.

2. 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.

3. 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? Is acid rain a problem for plant species and crops?

TYPE YOUR FULL NAME:

 

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Figure 3: Sprout lengths after 7 days of growth for radish seeds exposed to different pH values.

 

 

 

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