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Part Two: Ecology: The Science of Organisms and Their Environment
Chapter 4: Populations and Communities
Chapter 4 Post-Lecture Quiz
Chapter 4 Post-Lecture Quiz
This activity contains 25 questions.
If births equal 16, deaths equal 14, immigration equals 3, and emigration equals 6, what is the change in the population?
Which of the following is an example of an r-strategist?
When the number of organisms in a species falls to near the critical number, it is considered _______.
Which of the following is an example of a K-strategist?
Reproduction at a rate that maintains population size _______.
requires that death rate exceed birth rate
is rare in nature
indicates that the population is hovering around its carrying capacity
requires that recruitment not occur
If Type I species are K-strategists, Type III species are r-strategists, and Type II species are intermediate, which of the following is Type II?
Which statement about J-shaped population growth curves is true?
The initial population is large.
Population growth cannot continue indefinitely.
Population growth decelerates with time and then levels off.
Population size is not limited by carrying capacity.
Which of the following best demonstrates a density-dependent limiting factor?
global climate change
the number of nesting sites available
Carrying capacity is _______.
the maximum population size to which a species can grow in the best possible habitat
impossible to achieve in nature
the maximum population of a species that a given habitat will support without long-term degradation of the habitat
the maximum number of animals that can be supported by an ecosystem's food supply
Which of the following best demonstrates a density-independent limiting factor?
an early freeze
spread of a lethal disease
number of predators present
the amount of food available
Which of the following best describes top-down regulation of a red squirrel population?
lack of walnuts
predation by great-horned owls
too many walnuts
a homeowner cutting down an oak tree
Which of the following species is currently in the most danger of going extinct?
California condor, currently on the U.S. Endangered Species List
Northern Idaho ground squirrel, currently on the U.S. Threatened Species List
European starling, a species introduced to the United States
Yellow-rumped warbler, currently not on any federal protection list in the United States
Two white-footed mice vying for the same seed to eat exemplifies _______.
Which of the following relationships demonstrates commensalism?
a cheetah eating on a gazelle
a louse feeding on a human head
an orchid growing high in the branches of a tree
an oxpecker picking ticks, fleas, and flies off a hippopotamus
Which of the following relationships demonstrates mutualism?
two cardinals eating at the same bird feeder
a golden eagle eating a jackrabbit
a bee pollinating a plant
a tapeworm living in a dog
Which of the following categories includes all of the others?
"Survival of the fittest" means that _______.
those genes least susceptible to mutations will be passed on to the next generation
aggressive individuals in a population are most likely to survive and reproduce
individuals most adapted to their environment will most likely reproduce
long-lived species will outcompete short-lived species
When sea otters were overhunted in the Pacific Ocean, kelp forests were thrown out of balance. Thus, the sea otter is an example of _______________.
a top predator
a keystone species
Golden-winged and blue-winged warblers are considered separate species, but they can mate and produce viable hybrids. What does this indicate?
Reproductive isolation was never complete.
The genes of these species cannot mix.
The habitats of these species do not overlap.
Neither species is adapted to its habitat.
According to the principle of natural selection, which of the following demonstrates adaptation?
an individual red squirrel changing the type of nut that it eats
a population of red squirrels gradually changing over time in response to a changing climate
an individual red squirrel storing nuts for winter
a group of red squirrels growing to adults
The six zoogeographic regions of the world can be attributed to _______.
a volcanic eruption
In a natural ecosystem, some species survive and reproduce more offspring than other species. As a result, subsequent generations of the reproducing species _______.
are likely to go extinct
become larger to combat potential predators more successfully
exhibit traits favoring survival and reproduction in that ecosystem
live longer lives, so the total population size will increase
House sparrows are not native to the United States and have caused many native bird populations to decrease. Thus, the house sparrow is considered a(n) ___________ species.
Which of the following remedies for controlling a non-native species is the most complicated and potentially the most dangerous to an ecosystem?
requiring ships to exchange ballast water when entering the United States
asking people entering the United States whether they have fruits or vegetables with them
introducing a natural enemy for the non-native species
checking for increased importation at U.S. borders
Which of the following statements regarding introduced species is true?
Introduced species cause problems only in the United States.
Introduced plants never cause harm in new ecosystems because they are easily controlled.
Once a species is introduced to a new area, it is inevitable that it will wreak havoc on the ecosystem.
Some introduced species are considered pests in their new habitats.
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