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Chapter 49: Problem 7

According to the logistic model of population growth, the absolute number of individuals by which a population grows during a given time period: a. gets steadily larger as the population size increases. b. gets steadily smaller as the population size increases. c. remains constant as the population size increases. d. is highest when the population is at an intermediate size. e. fluctuates on a regular cycle.

Short Answer

Expert verified
The correct option is d) the absolute number of individuals by which a population grows during a given time period is highest when the population is at an intermediate size.

Step by step solution

01

Understanding the Factors

In the logistic model of population growth, the factors that matter include the size of the population and the availability of resources (carrying capacity). As the population increases, there are changes in the rate at which it grows.
02

Looking at the Options

Among the options a) to e), we need to identify which one correctly describes how the absolute number of individuals by which a population grows changes as the population size increases. This inherently means we're looking at rate of change, not the actual population size at any given moment.
03

Choosing the Correct Option

In logistic growth, the rate of population growth gets larger when population size initially increases from a small number (option a)), but it doesn't steadily get larger. It eventually slows down and gets reduced due to resource constraints (opposite of option b)). The growth does not remain constant as population size increases (option c)) nor does it fluctuate on a regular cycle (option e)). This leaves us with option d), suggesting that the population growth is highest at an intermediate size. This best describes the nature of logistic growth, which follows an S-shaped curve with the steepest slope (fastest rate of population growth) typically in the middle.

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Most popular questions from this chapter

Which example might reflect density-dependent regulation of population size? a. An exterminator uses a pesticide to eliminate carpenter ants from a home. b. Mosquitoes disappear from an area after the first frost. C. The lawn dies after a month-long drought. d. Storms blow over and kill all willow trees along a lake. e. The size of a clam population declines as the number of predatory herring gulls explodes.

A K-selected species is likely to exhibit: a. a Type I survivorship curve and a short generation time. b. a Type II survivorship curve and a short generation time. c. a Type III survivorship curve and a short generation time. d. a Type I survivorship curve and a long generation time. e. a Type II survivorship curve and a long generation time.

A uniform dispersion pattern implies that members of a population: a. cooperate in rearing their offspring. b. work together to escape from predators. c. use resources that are patchily distributed. d. may experience intraspecific competition for vital resources. e. have no ecological interactions with each other.

The number of individuals per unit area or volume of habitat is called the population's: a. geographical range. b. dispersion pattern. c. density. d. size. e. age structure.

One day you caught and marked 90 butterflies in a population. A week later, you returned to the population and caught 80 butterflies, including 16 that had been marked previously. What is the size of the butterfly population? a. 170 b. 450 C. 154 d. 186 e. 106
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