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19: Population Ecology
This activity contains 19 questions.
Newly introduced species usually increase the productivity of the area.
Foxes were able to use the rabbits as their sole source of food.
Eradication of introduced species is virtually impossible; the best that can be done is to minimize their impact.
Australians were able to eliminate all non-native animal and plant species entrenched in Australia.
Introduction of non-native species has been a tremendous economic benefit to Australians.
A population is defined as __________.
all the organisms that inhabit a particular area
a group of individuals of a single species that occupies the same general area
the sum of all the planet's ecosystems
a specific environment in which organisms live
all the abiotic factors in addition to the community of species in a certain area
To get an accurate estimate of the density of a particular species, an ecologist would __________.
count individuals within a square kilometer
decrease the number and size of sample plots where individuals are counted
need to know how many individuals are born or die and when new individuals enter or leave the population
determine the distribution of individuals among age groups
increase the number and size of the sample plots where individuals are counted
One piece of information that is available from a determination of population density is __________.
the number of individuals of a species per unit area or volume of the habitat
the identification of the most vulnerable stage of the life cycle of individuals
the reproductive success of a population
the distribution of individuals among age groups
Ecologists represent life table data graphically in a _____.
A set of traits that affects an organism's schedule of reproduction and survival is called its _____.
Human population growth __________.
has reached carrying capacity
is currently experiencing the Allee effect
is currently exponential
has an S-shaped curve
will not be stopped by environmental resistance
A decrease in the growth rate as the population size approaches carrying capacity is called __________.
exponential population growth
logistic population growth
The definition of a density-dependent factor is __________.
a population-limiting factor whose intensity is unrelated to population density
a population-limiting factor whose effects intensify as the population increases in density
a dramatic fluctuation in density with remarkable regularity
competition between individuals of the same species for the same limited resources
the growth rate decreasing as the population size approaches carrying capacity
The single greatest current cause of population decline is __________.
reduced genetic variability
the introduction of exotic species
According to the logistic growth model, the fastest growth rate of a population occurs when __________.
density-independent factors are involved
the population size is at roughly half the carrying capacity of the habitat
species are threatened
human economic and political pressures outweigh ecological concerns
hunting is allowed on a large scale
A non-native species that has spread far beyond the original point of introduction and causes environmental or economic damage is called a(n) _____.
Evolutionary changes in which an adaptation of one species leads to a counteradaptation in a second species is known as _____.
an invasive species
Kudzu is __________.
an invasive fish
a biological agent used to inhibit pathogenic fungi
under control in the deep South
an invasive vine
A combination of biological, chemical, and cultural methods for sustainable control of agricultural pests is called _____.
integrated pest management
Which of the following is the most accurate statement about the Earth's carrying capacity for humans?
The human population has already exceeded its carrying capacity.
The human population is still a long way from carrying capacity.
Our technology has allowed us to keep increasing carrying capacity.
The carrying capacity for humans is smaller now than it was a thousand years ago.
When it comes to humans, the concept of carrying capacity is irrelevant.
Age structures are helpful for predicting __________.
the genetic similarities among individuals in a population
susceptibilities of pests to biological control
life histories of individuals
a population's future growth
the presence of an invasive species
Which of the following is a definition of the ecological footprint?
the identification of those things that are likely to become endangered in the foreseeable future
the use of biological, chemical, and cultural methods for sustainable control of agricultural pests
the increase in the proportion of child-bearing women in the population
the factors that allow an invasive species to rapidly take advantage of a favorable habitat
the estimate of the amount of land required to provide the raw materials an individual or a population consumes
Which of the following is directly responsible for the rapid extinctions that are occurring at an accelerated pace on Earth?
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