The term homeostasis refers to
|A)||the maintenance of a consistent internal environment.|
|B)||the ability to conform internal temperature to environmental temperature.|
|C)||an organism's biotic potential.|
|D)||the carrying capacity of a population.|
Which of the following is not considered a population?
|A)||the ginkgo trees (Ginkgo biloba) in New York City|
|B)||the birds in your hometown|
|C)||the human inhabitants of Pennsylvania|
|D)||the grizzly bears (Ursus arctos) of Alaska|
A clumped population may be due to
|A)||weak interactions between the members of a population.|
|B)||intense competition for uniformly distributed resources.|
|C)||uneven distribution of resources in the environment.|
The tidewater goby (Eucyclogobius newberryi) is an endangered species of fish that occurs as metapopulations in isolated coastal wetlands of California. Large wetlands serve as sources of individuals for populations in small wetlands, which function as sinks due to inferior habitat quality. What effect would most likely be seen on the population of gobies if a barrier to migration between wetlands developed?
|A)||The populations in the small and large wetlands would evolve independently of each other.|
|B)||The populations in the large wetlands would most likely go extinct.|
|C)||The populations in the small wetlands would most likely go extinct.|
|D)||The populations in the small and large wetlands would most likely go extinct.|
Which of the following factors does not determine the growth rate of a population?
|A)||the population's sex ratio.|
|B)||the species' generation time.|
|C)||the age structure of the population.|
|D)||the optimal temperature at which an organism can reproduce.|
A population with a larger proportion of older individuals than younger individuals will likely
|A)||grow larger and then decline rapidly.|
|B)||continue to grow larger indefinitely.|
|C)||grow smaller and may stabilize at a smaller population size.|
|D)||not experience a change in population size.|
Humans are an example of an organism with a type I survivorship curve. This means
|A)||mortality rates are highest for younger individuals.|
|B)||mortality rates are highest for older individuals.|
|C)||mortality rates are constant over the life span of individuals.|
|D)||the population growth rate is high.|
According to the Population Reference Bureau (2002), the worldwide intrinsic rate of human population growth (r) is currently 1.3%. In the United States, r = 0.6%. How will the U.S. population change relative to the world population?
|A)||The world population will grow, while the population of the United States will decline.|
|B)||The world population will grow, while the population of the United States will remain the same.|
|C)||Both the world and the U.S. populations will grow, but the world population will grow more rapidly.|
|D)||The world population will decline, while the U.S. population will increase.|
The logistic population growth model, dN/dt = rN[(K - N)/K], describes a population's growth when an upper limit to growth is assumed. This upper limit to growth is known as the population's ____________, and as N gets larger, dN/dt _______________.
Which of the following is not an example of a density-dependent effect on population growth?
|A)||an extremely cold winter|
|B)||competition for food resources|
|C)||stress-related illness associated with overcrowding|
|D)||competition for nesting sites|