bio 111 – Flashcards
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A population is defined as __________.
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a group of individuals of a single species that occupies the same general area
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To figure out the human population density of your community, you would need to know the number of people living there and __________.
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the size of the area in which they live
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An ideal habitat with unlimited resources is associated with
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Exponential growth.
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The maximum population a habitat can support is its
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Carrying capacity.
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Logistic growth involves
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Population growth slowing down as the population approaches carrying capacity.
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In exponential growth
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Population size grows faster and faster as the population gets bigger.
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A population will always grow exponentially __________.
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if there are no limiting factors
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No population can grow indefinitely. The ultimate size of any population is limited by __________.
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the carrying capacity of its environment
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When birth rate equals death rate, __________.
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the size of a population remains constant
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A population of mice has grown so rapidly that there are 2,400 individuals in an ecosystem that will support about 1,800 mice. The mouse population is most likely to __________.
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undergo a dramatic decline in size, possibly to a stable level at or below 1,800 individuals
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Human population growth __________.
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is currently exponential
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A non-native species that has spread far beyond the original point of introduction and causes environmental or economic damage is called a(n) _____.
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invasive species
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What is a population?
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a group of individuals of the same species that occupy the same general area
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What best describes Type I survivorship?
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low death rate early in life, high death rate late in life
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Type I survivorship curves are typical of species that exhibit ______.
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few offspring and good parental care
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What best describes Type III survivorship?
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very high death rate very early in life followed by a decline in death rate
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Opportunistic species typically ______.
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have a large number of offspring
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Species that exhibit an equilibrial life history typically ______.
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have long lives
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In the absence of limiting factors, a population's growth follows a(n) ______ model.
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exponential
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In the absence of limiting factors, what shape does a population's growth curve most closely resemble?
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J
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If a population's growth rate decreases as the population size approaches carrying capacity, the population's growth follows a(n) ______ model.
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logistic
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______ is the maximum population size that a particular habitat can support.
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Carrying capacity
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According to the logistic growth model, what happens to a population when the size of the population reaches carrying capacity?
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The population stops increasing in size.
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Competition among individuals of the same species is ______ competition.
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intraspecific
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An unexpected freeze that kills a population of chipmunks is an example of ______.
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a density-independent factor
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Introduced species can have important effects on biological communities by ______.
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reducing biodiversity, competing with native species for resources, displacing native species, preying upon native species
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The intentional release of a natural enemy to attack a pest population is called _____.
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biological control
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Using a virus to control rabbit populations in Australia did not work because the rabbits became more resistant to the virus, and the virus became less lethal. This is an example of ______.
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coevolution
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Integrated pest management ______.
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advocates mixed-species plantings and rotating crops
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Throughout most of human history, human population size _____.
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grew very slowly
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In most developed countries, overall population growth rates ______.
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are near zero, so the population size is fairly stable
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In most developing countries ______.
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birth rates are much higher than death rates, so the population is growing rapidly
