Campbell Essential Biology with Physiology (5th Edition)
5th Edition
ISBN: 9780321967671
Author: Eric J. Simon, Jean L. Dickey, Jane B. Reece, Kelly A. Hogan
Publisher: PEARSON
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Textbook Question
Chapter 19, Problem 4SQ
Which of the following describes the effects of a density-dependent limiting factor?
- a. A forest fire kills all the pine trees in a patch of forest.
- b. Early rainfall triggers the explosion of a locust population.
- c. Drought decimates a wheat crop.
- d. Rabbits multiply, and their food supply begins to dwindle.
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Which of the following is an example of a microclimate affecting an organism's fitness?
Select one or more:
a. A rat carcass lying in a sunny location, slowing the growth of fungus on it.
b. Seasonal rainfalls increasing in frequency, allowing a tree to produce more seeds.
X
c. Average temperatures increasing across a forest, leading to a reduction in prey for wolves to feed on.
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d. A local wind mixing oxygen into the surface of a lake, increasing diatom photosynthesis rates
Which of the following would not be an example of density-deperident factors regulating population size?
The number of possible territories for robins is limited; thus when population sizes are high, a lower proportion of individuals can produce offspring.
A.
O B. In conditions of overcrowding, some desert pupfish living in ponds will emigrate to other ponds if given the opportunity.
C.Predation on mosquitofish is high, regardless of population size.
D. In conditions of high density, mice are more susceptible to mortality from heat stress.
E. In a habitat patch with a high density of muskrats, a disease spreads more rapidly and results in higher mortality.
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.
Chapter 19 Solutions
Campbell Essential Biology with Physiology (5th Edition)
Ch. 19 - What two values would you need to know to figure...Ch. 19 - Prob. 2SQCh. 19 - Prob. 3SQCh. 19 - Which of the following describes the effects of a...Ch. 19 - Prob. 5SQCh. 19 - Prob. 6SQCh. 19 - Prob. 7SQCh. 19 - Prob. 8PSCh. 19 - Interpreting Data The graph below shows data for...Ch. 19 - Prob. 10BS
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- A group of acarologists recorded 6,723 black-legged ticks (Ixodes scapularis) per acre in one patch of forest, and 329 black-legged ticks per acre in another patch of forest. What were the acarologists comparing? a. disperson b. carrying capacity c. density d. rangearrow_forwardThe number of individuals that occur per unit area is calleda. populationb. population growth.c. carrying capacity.d. population densityarrow_forwardA good number of snail population in the stagnant waters between rice paddies is growing under natural conditions with limited resources. As the snail population increases in size, how will population density affect its growth rate? a. Population density will increase and the rate of population growth will eventually slow. b. Population density will remain constant and population growth will increase. c. Population density will become unstable and population growth will stop. d. Population density will decrease and population growth will eventually increase.arrow_forward
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- A gypsy moth population has overtaken a grove of oak trees. The gypsy moths eat the trees, causing the trees to die. What type of density-dependent factor would the gypsy moths be considered?arrow_forwardThis map shows the spread of the red fire ant after its introduction into the United States in Mobile, Alabama, in the 1930s: Which statement best explains the importance of interspecific relationships in the success of this invasive species?a. Ecosystems with more resources will support the red ant over the native ant b. Invaded communities with higher species richness will allow the red ant to thrive c. Communities with fewer feeding relationships are less resilient to change. d. Native ants have a higher relative abundance compared to the invasive red ant.arrow_forwardHow have urban-rural inequalities evolved in China in recent years? a. They have been completely eradicated due to government policies. b. They have been significantly reduced but new inequalities in areas such as education and housing are emerging. c. They have worsened, with rural areas becoming more impoverished. d. They have stayed consistent, with no major changes observedarrow_forward
- A biologist determines the growth rate of a population of 198 frogs in a marsh near Beaverhill Lake, Alberta, to evaluate the quality of the environment. The researcher finds that, in one year, 34 were born, 86 died, 12 migrated into the marsh, and there was no emigration. a. frogs are considered an indicator species for the quality of the environment. Determine whether the growth rate of this population in one year is a cause for concern. if so, what might the concerns be?arrow_forwardWhat is the purpose of age pyramids? Select one: a. It is useful in determining whether a population is at carrying capacity or not. b. It is used to compare exponential or logistic growth rate. c. It is a useful tool to predict the future population size of a region. d. It helps to determine whether the population is K-selected or r-selected.arrow_forwardAccording to the competitive exclusion principle,a. one species is always more competitive than another for a particular food source.b. competition excludes multiple species from using the same food source.c. no two species can occupy the same niche at the same time.d. competition limits the reproductive capacity of species.arrow_forward
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