Biology

Lab 3 Ecology of Organisms BIO101L

Student Name: Click here to enter text.

Access Code (located on the lid of your lab kit):

Pre-Lab Questions

1. Would you expect endangered species to be more frequently generalists or specialists? Explain your answer.

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2. How does temperature affect water availability in an ecosystem?

Experiment 1: Effects of pH on Radish Seed Germination

Table 1

Water

Vinegar

Baking Soda

pH

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Day

Seeds Germinated

Observations

Seeds Germinated

Observations

Seeds Germinated

Observations

1

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2

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3

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4

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5

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6

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7

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Post-Lab Questions

1. Record your hypothesis from Step 6 here:

2. 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…).

3. 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.

4. 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.

5. 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?

6. Insert photo of your seeds on the 7th day with your name and access code handwritten in the background.

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