Ecology of Organisms

Effects of pH on Radish Seed Germination

Table 1: pH and % Radish Seed Germination (NOTE: First row will contain only pH information, rows 1-7 will contain the total number of seeds germinated as of that day)

(each cell is worth 2 point, for a total of 48 points)

Stage/Day Observations (initial pH, then # seeds germinated)Acetic AcidSodium BicarbonateWater
Initial pH
Day 1
Day 2
Day 3
Day 4
Day 5
Day 6
Day 7

Take a picture of your results. Include a note with your name and date on an index card in the picture. Insert picture here (3 points):

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Questions

1. Prepare a graph. 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 three lines (4 points each), a title (2 points), a label and units on the x and y axes (8 points), and provide a legend (2 points) describing which line corresponds to each plate (e.g., blue = acetic acid, green = sodium bicarbonate, etc…). You can prepare your graph in MS Excel and insert the image in the space below or you can prepare your graph by hand and scan it or photograph it and insert the image below. (worth 24 points)

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. (1st part of question worth 2 points, 2nd part of question worth 4 points, for a total of 6 points)

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. (1st part of question worth 2 points, 2nd part of question worth 4 points, for a total of 6 points)

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? (question has three parts, each worth 2 points, for a total of 6 points)

5. Research and briefly describe a real world example about how acid rain affects 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). (7 points)

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