Biology: Concepts and Investigations
5th Edition
ISBN: 9781260259049
Author: Hoefnagels
Publisher: MCG
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Textbook Question
Chapter 20.8, Problem 2MC
How would you design an experiment to determine whether one species of endophyte or some combination of multiple species protects leaves against pathogens?
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The data that is attached below was collected during a lettuce seed ecotoxicity assay. Lettuce seed assays are used to compare the ecotoxicity of methanol, ethanol, and isopropanol by these alcohols' effects on germination rate and root elongination. Using the attached data, help answer which alcohol seems to be the most toxic to lettuce seeds. Why or why not would your results be expected? What does this information tell you about using ecotoxicity data to estimate human toxicity?
A team of researchers investigated the effects of phosphorous availability and light intensity on an angiosperm species. Seeds of the angiosperm were divided into four equal groups. Groups 1 and 2 were exposed to 200 μmol, and Groups 3 and 4 were exposed to 500 μmol. Groups 2 and 4 also received a phosphorous (P) solution. After 20 days, all plants were weighed, and the average dry weight of each group was calculated. The results are in the table below.
Group 1(200 μmol, no P)
Group 2(200 μmol, + P)
Group 3 (500 μmol, no P)
Group 4 (500 μmol + P)
Average Dry weight (g)
0.8
1.1
1.5
6.2
Describe the effects of light and phosphorous on the growth of the plants in this study. Explain how the metabolic processes associated with the plant kingdom likely influenced these results.
Urkle decided he wanted to test the effects of watering his plants with cold coffee. For a week he watered one group of plants cold coffee. He ignored the other group of plants. Urkle has no idea what might happen to plants that receive coffee. What is wrong with Urkle's experimental design?
If Urkle wants to test the effects of cold coffee on plant growth, he should water his control group with cold water.
If Urkle wants to test the effects of cold coffee on plant growth, he should water the plants in the other group with Dr. Pepper.
If Urkle wants to test to test the effects of cold coffee on plant growth, he should water the plants in the other group with hot coffee.
If Urkle wants to test the effects of cold coffee on plant growth, he can ignore the control group as long as he makes sure both groups get the same amount of sun.
Chapter 20 Solutions
Biology: Concepts and Investigations
Ch. 20.1 - Prob. 1MCCh. 20.1 - Prob. 2MCCh. 20.1 - Prob. 3MCCh. 20.1 - Prob. 4MCCh. 20.1 - Prob. 5MCCh. 20.2 - Prob. 1MCCh. 20.2 - Prob. 2MCCh. 20.3 - Prob. 1MCCh. 20.3 - Prob. 2MCCh. 20.3 - Prob. 3MC
Ch. 20.4 - Prob. 1MCCh. 20.4 - Prob. 2MCCh. 20.5 - Prob. 1MCCh. 20.5 - Prob. 2MCCh. 20.5 - Prob. 3MCCh. 20.6 - Prob. 1MCCh. 20.6 - Prob. 2MCCh. 20.6 - Prob. 3MCCh. 20.6 - Prob. 4MCCh. 20.7 - Prob. 1MCCh. 20.7 - Prob. 2MCCh. 20.7 - Prob. 3MCCh. 20.7 - Prob. 4MCCh. 20.7 - How do scientists use lichens to monitor...Ch. 20.8 - Prob. 1MCCh. 20.8 - How would you design an experiment to determine...Ch. 20 - Prob. 1MCQCh. 20 - Prob. 2MCQCh. 20 - Prob. 3MCQCh. 20 - Prob. 4MCQCh. 20 - Fungi are considered __ because they get their...Ch. 20 - A dikaryoric cell develops into a zygote when a....Ch. 20 - Prob. 7MCQCh. 20 - Prob. 8MCQCh. 20 - Prob. 9MCQCh. 20 - Prob. 1WIOCh. 20 - Prob. 2WIOCh. 20 - Prob. 3WIOCh. 20 - Prob. 4WIOCh. 20 - Prob. 5WIOCh. 20 - Prob. 6WIOCh. 20 - Review figure 19.5, which shows the alternation of...Ch. 20 - Prob. 8WIOCh. 20 - Prob. 9WIOCh. 20 - Prob. 10WIOCh. 20 - Prob. 11WIOCh. 20 - Prob. 12WIOCh. 20 - Each ascus within an ascomycete fruiting body...Ch. 20 - Prob. 14WIOCh. 20 - Prob. 15WIOCh. 20 - Some endophytes produce compounds that fight...Ch. 20 - Prob. 17WIOCh. 20 - Prob. 18WIOCh. 20 - Prob. 19WIOCh. 20 - Prob. 1PITCh. 20 - Prob. 2PITCh. 20 - Prob. 3PIT
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