Biology
12th Edition
ISBN: 9781260494570
Author: Raven, Peter
Publisher: MCGRAW-HILL HIGHER EDUCATION
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Chapter 54, Problem 6U
Summary Introduction
Introduction:
The growth of the population slows down, when the
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The logistic population growth model, dN/dt = rN[(K – N)/K], describes a population’s growth when an upper limit to growth is assumed. As N approaches (numerically) the value of K
a. dN/dt increases rapidly.
b. dN/dt approaches 0.
c. dN/dt increases slowly.
d. the population becomes threatened by extinction.
A population that grew in close relation to the amount of resources available in the environment, would experience
A. exponential growth, such as shown on the J-shaped curve
B. logistic growth, such as shown on the S-shaped curve
C. unpredictable growth, such as shown on the ?-shaped curve
D.logistic growth, such as shown on the J-shaped curve
E. exponential growth, such as shown on the S-shaped curve
As a population size approaches (i.e. is almost equal to) carrying capacity for a certain population, which of the following outcomes is predicted by the logistic growth equation?
a.
The population growth rate will not change
b.
The population growth rate will approach zero
c.
The population size will increase exponentially
d.
The carrying capacity of the environment will increase
Chapter 54 Solutions
Biology
Ch. 54.1 - Prob. 1LOCh. 54.1 - Prob. 2LOCh. 54.1 - Explain how species adapt to environmental...Ch. 54.2 - Prob. 1LOCh. 54.2 - Prob. 2LOCh. 54.3 - Prob. 1LOCh. 54.3 - Prob. 2LOCh. 54.3 - Prob. 3LOCh. 54.4 - Prob. 1LOCh. 54.4 - Prob. 2LO
Ch. 54.5 - Prob. 1LOCh. 54.5 - Discuss why populations cannot grow exponentially...Ch. 54.5 - Define carrying capacity and explain what might...Ch. 54.6 - Prob. 1LOCh. 54.6 - Prob. 2LOCh. 54.6 - Prob. 3LOCh. 54.7 - Prob. 1LOCh. 54.7 - Prob. 2LOCh. 54.7 - Prob. 3LOCh. 54 - Prob. 1DACh. 54 - Prob. 2DACh. 54 - Prob. 3DACh. 54 - Prob. 4DACh. 54 - Prob. 5DACh. 54 - Prob. 6DACh. 54 - Prob. 1IQCh. 54 - Prob. 2IQCh. 54 - Prob. 3IQCh. 54 - Prob. 4IQCh. 54 - Prob. 5IQCh. 54 - Prob. 6IQCh. 54 - Prob. 7IQCh. 54 - Prob. 8IQCh. 54 - Suppose experimenters artificially kept the hare...Ch. 54 - Prob. 10IQCh. 54 - Prob. 11IQCh. 54 - Prob. 12IQCh. 54 - Source-sink metapopulations are distinct from...Ch. 54 - The potential for social interactions among...Ch. 54 - When ecologists talk about the cost of...Ch. 54 - Prob. 4UCh. 54 - The difference between exponential and logistic...Ch. 54 - Prob. 6UCh. 54 - Which of the following is an example of a...Ch. 54 - If the size of a population is reduced due to a...Ch. 54 - In populations subjected to high levels of...Ch. 54 - In a population in which individuals are uniformly...Ch. 54 - Prob. 4ACh. 54 - Refer to figure 55.8. What are the implications...Ch. 54 - Prob. 2SCh. 54 - Refer to figure 55.14. Because the number of...Ch. 54 - Refer to figure 55.26. Would increasing the mean...
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- Which of the following formulae describes logistic population growth? Group of answer choices a. dN/dt = rN((K-N)/K) b. dN/dt = rN c. p+q=1 d. rb>carrow_forwardA population that did not grow in close relation to the amount of resources available in the environment, and dramatically overshot the carrying capacity, would experience: A. logistic growth, such as shown on the S-shaped curve B. exponential growth, such as shown on the J-shaped curve C. unpredictable growth, such as shown on the ?-shaped curve D. exponential growth, such as shown on the S-shaped curve E.logistic growth, such as shown on the J-shaped curvearrow_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
- When an environment has reached its carying capacity for a certain population, which of the following is true? A. Growth and immigration rate is equal to death and emigration rate. B. Growth and immigration rate is greater than death and emigration rate. C. Growth and immigration rate is less than death and emigration rate. D. Growth rate is exponential. Answer Why do you believe this is the correct answer.arrow_forwardWhich of the following is a plausible consequence of delayed density dependence in a population that would otherwise have logistic growth? A. Increased environmental stochasticity B. Dampened oscillations C. Population cycles D.Both B and C E. None of the above result from delayed density dependencearrow_forwardUnder logistic population growth what happens as N becomes similar in size to K? Group of answer choices a. population growth speeds up b. K shrinks c. K expands d. population growth approaches zero e. population growth becomes negativearrow_forward
- The curve below shows the growth rate of a population that has a per capita growth rate of 0.4. Which of the following is true about this curve. More than one is possible. exponential growth 2500000 2000000 1500000 1000000 500000 0 5 10 15 20 25 Select one or more: Ua. r becomes greater as the population grows because there are more births per year. b. There are more births per generation as you move right on the graph c. exponential growth is most often observed in stable populations that have resided in an environment for a long time. Od. The slope of the curve changes continuously as you move to the right even though r remains the same.arrow_forwardA region of North America has a population of 65,000 deer in 2016. The deer are kept in check by a wolf population. The carrying capacity of this region allows for 82,000 deer. For this example, assume the rmax is 1.0. With this information, answer/calculate the following:arrow_forwardWhich of the following accurately describes a trophic cascade? a. Sunflower stars, as a primary predator within Northern California bull kelp forests, have an indirect positive impact on the sea urchin's main prey, the bull kelp. b. Sunflower stars, as a primary predator within Northern California bull kelp forests, have an direct positive impact on the sea urchin's main prey, the bull kelp. c. Sunflower stars prey directly on kelp and keep kelp populations in check. d. The presence of Pisaster sea stars benefits Mytilus mussels, a primary producer.arrow_forward
- a) The region numbered 3 on the graph represents the __A__ brought on by the limiting factors called __B___. Select one: a. A B Carrying capacity Environmental resistance b. A B Environmental resistance Exponential growth c. A B Exponential growth Lag phase d. A B Lag phase Carrying capacity b) The region of the graph that illustrates the exponential growth of a population and the type of graph illustrated are, respectively: Select one: a. Exponential Growth Type of Graph 4 S-shaped b. Exponential Growth Type of Graph 2 Logistic c. Exponential Growth Type of Graph 3 J-Shaped d. Exponential Growth Type of Graph 1 Exponential c) What do the regions numbered 2 and 4 on the graph represent? Select one: a. Region #2 Region #4 Immigration and birth rate is less than emigration and death rate. Emigration and death rate is less than immigration and birth rate. b. Region #2…arrow_forwardBased on the equation for logistic population growth, Logistic Growth O A. new Individuals are added most rapidly at low population sizes. This figure displays the equation for logistic population growth and visualizes population growth as a function of time (number of generations) as it approaches carrying capacity. N stands for population size, K stands for carying capacity, and r stands for intrinsic rate of increase. O B. population growth never exceeds K. C. growth rate decreases as N approaches K. D. the population keeps growing when N equals K. K= carrying capacity dN (K-N) dt Number of generations ered MacBook Air F10 F11 吕口 F3 888 F4 F5 F1 F2 $ % & * @ 7 9 2 4 Y P Q W E R F G H K A S D C V N M Z .. * CO B #3 Population size (M)arrow_forwardThe growth of a population of rare South American beetles is given by the logistic function with k = 0.00001 and t in months. Assume that there are 200 beetles initially and that the maximum population size is 10,000. a. Find the growth function G1t2 for these beetles. Find the population and rate of growth of the population after the following times. b. 6 months c. 3 years d. 7 years e. What happens to the rate of growth over time?arrow_forward
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