Biology 115 (chapter14) – Flashcards
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Ecology is best defined as the study of:
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The relationships between all living organisms and their environments.
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On average, which leaves more offspring that survive to become adults and reproduce: a pair of elephants or a pair of rabbits?
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If both populations are stable, the pair of elephants and the pair of rabbits will leave the same number of offspring that survive to become adults and reproduce.
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In a population exhibiting logistic growth, the rate of population growth is greatest when N is:
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0.5K
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In a population, as N approaches K, the logistic growth equation predicts that:
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The growth rate will approach zero.
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The number of individuals that can be supported in a given habitat is the:
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None of the above: innate capacity for increase, biotic potential, density-dependant, or density-independant
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Which of the following statements about maximum sustainable yield is incorrect?
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The maximum sistainable yield for a population is a useful management guideline for harvesting plant products such as timber, but is not helpful for managing animal populations.
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Dr. David Reznick has studied life history evolution in guppies that live in stream in Trinidad. Guppies are found in two different types of habitat: sites where predation is high, and sites where predation is low. Which of the following life history characteristics would you expect to evolve in a guppy population living in a high-predation site?
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Increased egg number
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The death rate of organisms in a population exhibiting a type III survivorship curve is:
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Lower after the organisms survive beyond the earliest age groups.
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Which of the following is a major tradeoff in life histories?
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Growth for reproduction
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Natural Selection:
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Cannot weed out from a population any alleles that do not reduce an individual's relative reproductive success, even if these alleles increase an individual's risk of dying.
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Which of the following statements about the hazard factor of a population is incorrect?
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It is a measure of how quickly the individuals in a population age.
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Life extension:
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Has been acheived using labratory selection for delayed reproduction.
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A population pyramid:
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Represents the number of individuals in various age groups in a population.
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A primary difference between the age pyramids of industrialized and developing countries is that:
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In developing countries, much larger proportions of the population are in the youngest age groups.
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Which statement best describes expectationbs for the world's human population by the year 2010?
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It will exceed 7 billion if the current rat eof increase continues.
