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Chapter 56: Q5TYU (page 1258)
Question: What is the oxidizing agent in the following reaction?
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DRAW IT Suppose that you are managing a forest reserve, and one of your goals is to protect local populations of woodland birds from parasitism by the brown-headed cowbird. You know that female cowbirds usually do not venture more than about 100 m into a forest and that nest parasitism is reduced when woodland birds nest away from forest edges. The reserve you manage extends about 6,000 m from east to west and 3,000 m from north to south. It is surrounded by a deforested pasture on the west, an agricultural field for 500 m in the southwest corner, and intact forest everywhere else. You must build a road, 10 m by 3,000 m, from the north to the south side of the reserve and construct a maintenance building that will take up 100 m2 in the reserve. Draw a map of the reserve, showing where you would put the road and the building to minimize cowbird intrusion along edges. Explain your reasoning.
Which of the following statements best distinguishes hypotheses from theories in science?
a. Theories are hypotheses that have been proved.
b. Hypotheses are guesses; theories are correct answers.
c. Hypotheses usually are relatively narrow in scope; theories have broad explanatory power.
d. Theories are proved true; hypotheses are often contradicted by experimental results.
The variation found in a set can be estimated by the standard deviation, s:
\({s_x}\, = \sqrt {\frac{1}{{n - 1}}} \sum {({x_i}} - \,\overline x {)^2}\)
Calculate the standard deviation for each treatment.
Treatment | Dose (mg/kg) | Log of number of colonies | Mean (\(\overline x \,\)) | \({x_i}\, - \,\overline x \) |
Control | - | 9.0,9.5,9.0,8.9 | 9.1 | (-0.1), 0.4, (-0.1), (-0.2) |
Vancomycin | 1.0 | 8.5,8.4,8.2 | 8.36 | 0.14, 0.04, (-0.16) |
5.0 | 5.3,5.9,4.7 | 5.3 | 0, 0.6, (-0.6) | |
Teixobactin | 1.0 | 8.5,6.0,8.4,6.0 | 7.22 | 1.28, (-1.22), 1.18, (-1,22) |
5.0 | 3.8,4.9,5.2,4.9 | 4.7 | (-0.9), 0.2,0.5, 0.2 |
The measurements taken at Mauna Loa represent average atmospheric CO2 concentrations for the Northern Hemisphere. Suppose you could measure CO2 concentrations under similar conditions in the Southern Hemisphere. What pattern would you expect to see in those measurements over the course of a year? Explain.
Suppose a developer proposes to clear-cut a forest that serves as a corridor between two parks. To compensate, the developer also proposes to add the same area of forest to one of the parks. As a professional ecologist, how might you argue for retaining the corridor?
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