Campbell Essential Biology (7th Edition)
7th Edition
ISBN: 9780134765037
Author: Eric J. Simon, Jean L. Dickey, Jane B. Reece
Publisher: PEARSON
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Textbook Question
Chapter 19, Problem 7SQ
According to data on ecological footprints,
- a. the
carrying capacity of the world is 10 billion. - b. Earth’s resources are sufficient to sustain future generations at current levels of consumption.
- c. the ecological footprint of the United States is more than twice the world average.
- d. nations with the largest ecological footprints have the fastest
population growth rates.
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The carrying capacity (K) is the maximum population size that can be supported or sustained by a given environment. Which of the following statements about the carrying capacity is NOT true?
Select one:
a. We can think of K as some "average" value that a given environment can support.
b. Environmental fluctuations cause the carrying capacity to fluctuate over time.
c. Once a population reaches its carrying capacity, the size of the population remains constant.
d. When a population overshoots K, individuals die due to lack of resources.
Some people believe our most important goal should be to sharply reduce the rate of population growth in developing countries where 97% of the world’s population growth is expected to take place. Others argue that the most serious environmental problems stem from high levels of resource consumption per person in developed countries, which use 88% of the world’s resources and have much larger ecological footprints per person than do developing countries. What is your view on this issue? Explain
As a population’s size increases toward the ecosystem’s carrying capacity,a. environmental resistance increases.b. the rate of population growth slows.c. the death rate increases.d. All of the above are correct.
Chapter 19 Solutions
Campbell Essential Biology (7th Edition)
Ch. 19 - What two values would you need to know to figure...Ch. 19 - If members of a species produce a large number of...Ch. 19 - Prob. 3SQCh. 19 - Prob. 4SQCh. 19 - Prob. 5SQCh. 19 - Prob. 6SQCh. 19 - According to data on ecological footprints, a. the...Ch. 19 - The mussel secretes a combination of molecules...Ch. 19 - The lynx is one of the main predators of the...Ch. 19 - Life history traits, like anatomical features, are...
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- Which of the following is true about the length of food chains? a. Food chains can support up to 10 trophic levels. b. Food chains are shorter in stable habitats. c. Energy lost as heat at each trophic level limits the length of food chains. O d. The extinction of a species in a food chain will affect only the species directly preying upon it. e. An ecosystem with a high-enough number of species will feature a limitless length of food chain.arrow_forwardIn the following food chain, what biomass of phytoplankton will have been required to produce a 1 kg of big fish? Assume a typical figure for ecological efficiency. Phytoplankton eaten by Zooplankton eaten by Small fish eaten by Big fish A. 10 kg B. 10000 kg (10 metric tons) C. 100000 kg (100 metric tons) D. 100 kg E. 1000 kg (1 metric ton)arrow_forwardA population will most likely deplete the resources of its environment if the population . A. grows beyond carrying capacity B. must share resources with many other species C. moves frequently from one habitat to another D. has a low reproductive potentialarrow_forward
- Choose the following term that corresponds with the definitions listed below. a. Biotic potential b. Exponential growth c. Logistic Growth d. Carrying capacity 1. A growth pattern that forms a S-shaped curve ________ 2. Theoretical highest possible reproductive capacity of a population given little to no environmental resistance ________ 3. A growth pattern that forms a J-shaped curve __________ 4. The theoretical population size that a fiven region can sustain over a prolonged time period ____________arrow_forwardWhich of the following statements best represents the productivityhypothesis regarding species richness?a. The larger the area, the greater the number of species that will befound there.b. Temperate regions have a lower species richness due to the lack oftime available for migration after the last Ice Age.c. The number of species in a particular community is directly relatedto the amount of available energy.d. As invertebrate productivity increases, species richness will increase.e. Species richness is not related to primary productivity.arrow_forwardHow does the logistic growth model of population growth differ from the exponential growth model? A. The graph of the exponential model is S-shaped. B. The logistic growth model shows an unrestricted growth rate. C. The logistic growth model considers the environment's carrying capacity. D. The exponential growth model shows a restricted growth rate.arrow_forward
- The point at which a population has reached the limit for which an area can support is known as… Select one: A. The upper limit B. The carrying capacity C. A die back D. The laws of population growth E. Environmental push backarrow_forwardIf the animal population increased, the amount of atmospheric carbon would: A. increase B.decrease C.stay the samearrow_forwardExponential growth often occurs whena. a population nears carrying capacity.b. a population exceeds carrying capacity.c. organisms invade a new habitat.d. the birth rate exceeds the death rate for a singlegeneration.arrow_forward
- Sunlight drives the production of terrestrial grasses along the bank of a tropical river. Hippo consume the grass and then defecate in the river which fertilizes aquatic plants. This assemblage is best referred to as a… a. population b. trophic cascade c. commensalism d. ecosystem e. communityarrow_forwardInplants, “self-thinning” refers to reduction in:a.the biomass of an individual in response to competition.b.the total biomass of a population in response to competition.c.both population density and population biomass in response tocompetition.d.population density in response to competition, as population biomassincreases.e.population density due to grazing by herbivores.arrow_forwardMaximum population an area can sustain A. Arithmetical Growth B. Carrying Capacity C. Intrinsic Rate of Growth D. Exponentialarrow_forward
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