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Chapter 14 Quiz 3
Final Practice
20
Biology
05/09/2011

Term
 The 20 female adults in a small population each have a probability of 0.5 of producing a single offspring each year and a probability of 0.5 of producing no offspring. How many offspring will be produced each year?
Definition
 10 offspring per year on average, with some variation around this average
Term
 Which of the following is NOT a factor that limits population growth?
Definition
 All of these factors may limit population growth.
Term
 A population pyramid that gets wider in shape with higher age groups represents _____ while a population pyramid with nearly parallel lines represents _____.
Definition
 declining growth; stationary growth
Term
 Density-dependent and density-independent factors influence the growth of a population by causing changes in the:
Definition
 birth rate and death rate.
Term
 When the hazard factor is low, individuals tend to reproduce:
Definition
 later in life.
Term
 From the following, select the best example of a cohort.
Definition
 a group of birds born in the same year
Term
 In the equation for logistic growth, when N=K:
Definition
 population growth stops.
Term
 Population density is determined by the number of:
Definition
 individuals of a species in a given area.
Term
 How does exponential growth differ from logistic growth?
Definition
 The logistic model of growth incorporates environmental limitations on population size.
Term
 Natural populations fluctuate through time. One of the forces causing variation in population size is variation in the physical environment, which can have both direct and indirect effects on populations. Variation in population size linked to environmental factors (aside from those which occur daily or seasonally) is likely to:
Definition
 be irregular, perhaps even random.
Term
 When determining the growth rate of a population, which of the following are NOT important?
Definition
 starting population size
Term
 Which of the following best exemplifies an organism with a Type I survivorship curve?
Definition
 elephants
Term
 The population size that a particular habitat can support indefinitely is called the:
Definition
 carrying capacity.
Term
 What type of effect has an increasing impact as the population size increases?
Definition
 density-dependent effect
Term
 In years when beech trees produced a large crop of nuts, growth rings were narrow. This is best explained by:
Definition
 the tradeoff that exists between growth and reproduction.
Term
 A population of meadow voles has an annual per capita birth rate of 0.08 and an annual per capita death rate of 0.02. Estimate the number of individuals added to or lost from a population of 1000 individuals in one year.
Definition
Term
 In an experiment that doubled the average life span of fruit flies, the easiest experimental methodology that worked involved:
Definition
 waiting an extra week to collect eggs, thus ensuring that the parents of those eggs were longer-lived than average.
Term
 In the lynxâ€“snowshoe hare oscillating cycle of population growth, when the hare population size grows, more food is provided for the lynx. Which is the IMMEDIATE next step in this cycle?
Definition
 The lynx reproduce at a higher rate.
Term
 A organisms with a slow development and a high investment in their young will most likely have a __________ survivorship curve.
Definition
 Type I
Term
 A population pyramid:
Definition
 reflects the number of individuals in various age groups in a population.
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