Self-Quiz

Life on Earth Chapter 28 Population Growth and Regulation
Self-Quiz

Why do many animals defend territories?
1. to monopolize the resources within the territory
2. to avoid predation
3. to secure overwintering sites
4. to advance within a dominance hierarchy
5. to avoid each other
For exponential growth to occur, the following conditions are necessary:
1. There is no mortality.
2. There are no density-independent limits.
3. The birth rate consistently exceeds the death rate.
4. A species is very fast reproducing.
5. The species is an exotic invader in an ecosystem.
Which of the following currently contributes most to human population growth within the United States?
1. the consequences of the "baby boom"
2. immigration
3. a birth rate above RLF
4. average birth rate
5. emigration
Which is the most common type of spatial distribution?
1. logistic
2. uniform
3. random
4. exponential
5. clumped
Which continent has the highest rate of human population growth?
1. North America
2. Africa
3. Asia
4. Australia
5. South America
If a population is above carrying capacity, what must happen?
1. It must immediately crash.
2. It can remain stable indefinitely.
3. If the species is territorial, it can continue to increase.
4. It must eventually decline.
5. It must decline if it is not territorial.
The study of the way organisms interact with each other and with their environment is called
1. physiology
2. anatomy
3. morphology
4. genetics
5. ecology
Which of the following would be an abiotic component of the classroom environment?
1. bacteria on your skin
2. the light shining in the window
3. the cockroaches in the wall
4. the people taking this test
5. dust mites living in the dust on the floor
Environmental resistance may limit the size of populations by
1. increasing both birth and death rates
2. decreasing both birth and death rates
3. increasing death rates and/or decreasing birth rates
4. decreasing death rates and/or increasing birth rates
5. changing the biotic potential
When a population has inhabited an area for a long time and the population size has stabilized because of resource limitations:
1. Carrying capacity has been reached.
2. Availability of food and disease contributes to limit growth.
3. Predation decreases.
4. Only choices a and b are correct.
5. Choices a, b, and c are correct.
An insect population grows exponentially until an early winter freeze kills almost all of the insects. The next spring, the population grows exponentially again. This type of population growth is known as
1. boom and bust
2. sigmoidal
3. density-dependent
4. density-independent
5. sustained
Predators and parasites are always harmful to their prey or host populations.
1. True.
2. False, because predators always harm the prey population, but parasites often do little or no harm.
3. False, because parasites always harm their host populations but predators may be helpful.
4. False, because parasites and predators kill their hosts and prey.
5. False, because predators and parasites often help the host or prey population by attacking the weak.
What type of competition has occurred when one organism uses social or chemical interactions to limit the access of other individuals to resources?
1. contest competition
2. scramble competition
3. interspecific
4. intramural
5. social
Birds that defend even-sized territories around their nests are
1. randomly distributed
2. socially distributed
3. aggregated
4. uniformly distributed
5. dispersed according to a J-curve
Human populations have continued to grow because humans have increased the ____________ of the earth by agriculture, medicine, and technology.
1. biotic potential
2. evolutionary pressure
3. environmental resistance
4. fertility
5. carrying capacity

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