EBK BIOLOGY
11th Edition
ISBN: 8220101472069
Author: Byers
Publisher: PEARSON
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Chapter 27, Problem 8RQ
Explain why environmental resistance has not prevented exponential human population growth since prehistoric times; provide examples. Can this continue? Explain why or why not.
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Describe the historical pattern of growth of the worldwide human population since our origin. Include in this historic overview the changes that have happened technologically, medically, culturally and nutritionally to result in major population changes over time. Relate the growth of the human population to our ecological footprint and explain the idea of limits to population growth known as the carrying capacity. Relative to carrying capacity, what may result from unbridled continued growth of our population? How does the size of the human population contribute to environmental degradation? Why must we take the human population size into account when we attempt to develop environmental restoration projects?
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What is the likelihood that Earth's population problems will be solved by technological advancements? Explain.
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Chapter 27 Solutions
EBK BIOLOGY
Ch. 27 - Density-independent environmental resistance...Ch. 27 - Prob. 2MCCh. 27 -
3. Which of the following did not contribute to...Ch. 27 - Prob. 4MCCh. 27 - Boom-and-bust populations a. do not experience...Ch. 27 - Graphs that plot how the numbers of individuals...Ch. 27 -
2. The type of growth that occurs in a population...Ch. 27 - The maximum population size that can be sustained...Ch. 27 - The type of spatial distribution likely to occur...Ch. 27 - A population grows whenever the number of plus...
Ch. 27 -
1. Define biotic potential, list the factors that...Ch. 27 - Write and describe the meaning of the equation for...Ch. 27 - 3. Draw, name, and describe the properties of a...Ch. 27 -
4. Define environmental resistance and...Ch. 27 -
5. What is logistic population growth? What is...Ch. 27 - Describe three different possible consequences of...Ch. 27 - Prob. 7RQCh. 27 -
8. Explain why environmental resistance has not...Ch. 27 -
9. Draw the general shape of age structure...Ch. 27 - Sketch and label the graph showing the general...Ch. 27 -
1. Research a developing country (such as...Ch. 27 -
2. The U.S. Endangered Species Act (ESA) seeks to...
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- INTERPRET DATA Examine the top and middle graphs in Figure 54-5. Are these examples of exponential or logistic population growth? Where is K in each graph? (You may need to refer to Chapter 53 to answer these questions.) RESULTS AND CONCLUSION: The top and middle graphs show how each species of Paramecium flourishes when grown alone. The bottom graph shows how they grow together, in competition with each other. In a mixed culture, P. aurelia outcompetes P. caudatum, resulting in competitive exclusion. SOURCE: Adapted from G.F. Gause, The Struggle for Existence (Williams and Wilkins, Baltimore, 1934). Figure 54-5 G.F. Gauses classic experiment on interspecific competitionarrow_forwardAnswer these questions A) A population of 25 animals is growing exponentially, and the population has a growth rate of 0.7. How big would the population be after 5 years? B) What's the difference between exponential and logistic growth?arrow_forwardIn many rural areas, stray cats are a problem as they may return to being wild feral cats that have not been spayed or neutered can reproduce, which may result in a population of feral cats. One pair of cats can produce 12 kittens in one year, and half of these kittens are female; this increased population would potentially produce 84 kittens in the second year. In 5-years, the population could reach almost 33000 feral cats. A) What conditions or factors would have to be in place for the population to achieve its biotic potential?arrow_forward
- 1.) At approximately what year did the human population enter an exponential growth phase? 2.) Prior to that time, what was the approximate carrying capacity of Earth? 3.) State three significant technological developments that have acted to increase the carrying capacity of Earth’s environment since that time. 4.) Provide two examples of density-dependent factors that are contributing to or have the potential to contribute to environmental resistance in human populations.arrow_forwardMention any four probable reasons for the rapid rise of population in our country?arrow_forwardExplain the differences between equations for exponential population growth, logistic population growth, and Lotka-Volterra models for competition. Illustrate how and explain why these equations yield different trends?arrow_forward
- Draw the general shape of age structure diagrams characteristic of (a) expanding, (b) stable, and (c) shrinking populations. Label all the axes. Explain why you can predict the next several decades of growth by the current age structure of populations.arrow_forwardDescribe what the ramifications of this population growth will be in your area and what specific technological improvement should be done in your area to ensure the continued survival of humans.arrow_forwardUse this graph of the idealized exponential and logistic growth curves to complete the following. a. Label the axes and curves on the graph.b. What does the dotted line represent? c. For each curve, indicate and explain where population growth is the most rapid. d. Which of these curves better represents global human population growth?arrow_forward
- Read and highlight ways limiting factors affect the population growth Examples of how limiting factors affect population growth Abiotic (nonliving) limiting factors include things like wildfire, hurricanes, pollutants, droughts, floods and seasonal climate extremes. These factors limit all populations in a given area regardless of the size of the population. For example, a wildfire that sweeps through a dense forest in the Everglades has a big impact on every population in the ecosystem, regardless of how big the population is. Limiting factors can also be biotic-having to do with living organisms. Competition and predation are examples of biotic living factors. Organisms compete for available resources like food, water, and shelter. If the resources are plentiful then the populations can increase because there is less competition. If the resources are decreased in an area, competition increases and population size decreases. For example Mountain chickadees (Parus gambeli) compete for…arrow_forwardEach May, harp seals give birth off the coast of Newfoundland and Labrador. In a hypothetical situation, an initial population of 900 seals gives birth to 390 pups, and during the next 12 months, 60 seals die. Assuming that the population is growing geometrically, what will the harp seal population be in 12 years? A formal solution is requiredarrow_forwardAn ecologist studies a population of animals in a small field over several years. He measures the birth rate ( B) and death rate ( D) over that period. The data are shown in the graph. 0.6 0.5 0.4 0.3 0.2 0.1 1 2 3 4 Time (years) + Birth- Death What was the per capita growth rate (dN/dt, number/year/individual) at year 3.5? (Express the answer in two decimal places) Rate (numberlyear/individual)arrow_forward
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