Biology: The Dynamic Science (MindTap Course List)
4th Edition
ISBN: 9781305389892
Author: Peter J. Russell, Paul E. Hertz, Beverly McMillan
Publisher: Cengage Learning
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Chapter 7, Problem 3ITD
As CO2 concentrations increase in the atmosphere, biologists continue to explore the role of respiration from plants as a small but potentially important contribution beyond fossil fuel combustion. The data in the Table were collected from the leaf of a sagebrush plant from a semiarid ecosystem in Wyoming, enclosed in a chamber that measures the rate of CO2 exchange. The respiration rate is the amount of CO2 in micromoles lost by the leaf per square meter per second, which results in the negative numbers. The temperature values are from the leaves as they are heated or cooled during the measurements.
| Observation | Temperature (°C) | Respiration Rate (μmol/m2/s) |
| 1 | 25 | -2.0 |
| 2 | 30 | -2.7 |
| 3 | 35 | -4.1 |
| 4 | 40 | -5.8 |
| 5 | 20 | -1.3 |
| 6 | 15 | -1.0 |
| 7 | 10 | -0.7 |
© Cengage Learning 2017
What describes the relationship between temperature and respiration, a line or a curve? Does the Q10 that you calculated in 2 suggest a line or a curve?
Source: Data based on unpublished research by Brent Ewers, University of Wyoming.
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The loss of water from a plant by transpiration cools the leaf. Movement of water in transpiration requires both adhesion to the
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of transpiration of a crop species to extend its range into warmer climates. The scientist substituted a nonpolar solution with an
atomic mass similar to that of water for hydrating the plants. What do you expect the scientist's data will indicate from this
experiment?
The rate of transpiration will be the same for both water and the nonpolar substance.
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Under controlled conditions, a transpiration experiment was conducted using two different
plant species, A and B. Each plant species was exposed to a low-humidity environment and
a high-humidity environment with all other conditions kept the same. The transpiration
rate was measured over a period of one hour. The data was graphed as shown below.
A
B
transpiration rate (pl/cm²min)
с
0.2
0.18
0.16
0.14
0.12
0.1
0.08
0.06
A bar graph of the transpiration rates of two plants under different humid conditions
D
0.04
0.02
low humidity
40%
In order to see the effect the change in humidity had on the transpiration rate, what would be a proper con
trol to add to the study?
high humidity
80%
running the same experiment multiple times to collect additional data
adding more water to the original plants and running the experiment again
grow another set of plants at normal humidity
growing more plants at 0% and 100% humidity
Species A
Species B
Chapter 7 Solutions
Biology: The Dynamic Science (MindTap Course List)
Ch. 7.1 - Prob. 1SBCh. 7.1 - Distinguish between cellular respiration and...Ch. 7.2 - Prob. 1SBCh. 7.2 - What is the redox reaction in glycolysis?Ch. 7.2 - How is ATP synthesized in glycolysis?Ch. 7.3 - Summarize the fate of pyruvate molecules produced...Ch. 7.4 - What distinguishes the four complexes of the...Ch. 7.4 - Prob. 2SBCh. 7.5 - Prob. 1SBCh. 7.5 - Prob. 2SB
Ch. 7.6 - Prob. 1SBCh. 7.6 - What are the types of molecules that are the...Ch. 7.6 - Prob. 3SBCh. 7 - What is the final acceptor for electrons in...Ch. 7 - Prob. 2TYKCh. 7 - Prob. 3TYKCh. 7 - Prob. 4TYKCh. 7 - Prob. 5TYKCh. 7 - Prob. 6TYKCh. 7 - Prob. 7TYKCh. 7 - Prob. 8TYKCh. 7 - Which of the following statements is false?...Ch. 7 - In the 1950s, a diet pill that had the effect of...Ch. 7 - Discuss Concepts Why do you think nucleic acids...Ch. 7 - A hospital patient was regularly found to be...Ch. 7 - 13. There are several ways to measure...Ch. 7 - Apply Evolutionary Thinking Which of the two...Ch. 7 - Prob. 1ITDCh. 7 - Prob. 2ITDCh. 7 - As CO2 concentrations increase in the atmosphere,...Ch. 7 - Prob. 4ITD
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