Ch 9: Population size
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Questions and Answers

What impacts the natality rate within a population?

  • Immigration
  • Migration
  • Fertility (correct)
  • Emigration

    • Which factor defines the maximum number of individuals that an ecosystem can sustain indefinitely?

  • Environmental Resistance
  • Immigration
  • Fertility
  • Carrying Capacity (correct)

    • What refers to the periodic movement of organisms from one location to another?

  • Population Stability
  • Immigration and Emigration
  • Migration (correct)
  • Fertility Regulation

    • What factor includes limiting factors like availability of water, food, and space?

    <p>Environmental Resistance</p> Signup and view all the answers

    Which population has a zero growth rate and maintains a balance with the environment?

    <p>Stable Population</p> Signup and view all the answers

    What leads to resource depletion and subsequent population decline?

    <p>Carrying Capacity Exceedance</p> Signup and view all the answers

    Which factor involves individuals permanently leaving a population?

    <p>Emigration</p> Signup and view all the answers

    What distinguishes density-dependent factors from density-independent factors?

    <p>Density-dependent factors are proportional to population size, while density-independent factors affect populations regardless of size.</p> Signup and view all the answers

    Which phase of logistic growth is characterized by a rapid increase in population size?

    <p>Exponential growth phase</p> Signup and view all the answers

    What is the defining feature of geometric growth observed in organisms like bacteria?

    <p>Population size doubles each generation</p> Signup and view all the answers

    Which method of determining population size involves using quadrats to estimate density in a defined area?

    <p>Quadrat Sampling</p> Signup and view all the answers

    What phase of logistic growth represents the slowing of growth as environmental resistance increases?

    <p>Decelerating growth phase</p> Signup and view all the answers

    Which factor would affect a population proportionally to its size according to the text?

    <p>Disease</p> Signup and view all the answers

    What does mark-recapture involve for estimating total population?

    <p>Capturing and marking a sample, then recapturing to estimate total population size</p> Signup and view all the answers

    Why is direct counting useful for large or sessile organisms?

    <p>It allows for counting individuals directly</p> Signup and view all the answers

    What distinguishes density-dependent factors from density-independent factors?

    <p>Density-dependent factors influence a population proportionally to its size.</p> Signup and view all the answers

    Which phase of logistic growth is characterized by population size stabilizing around the carrying capacity?

    <p>Equilibrium phase</p> Signup and view all the answers

    What factor leads to a potential decline in population if it cannot sustain its resource use?

    <p>Carrying capacity</p> Signup and view all the answers

    Which method estimates total population based on the proportion of marked to unmarked individuals?

    <p>Mark-recapture studies</p> Signup and view all the answers

    In geometric growth, what does a J-shaped curve indicate?

    <p>Rapid exponential growth</p> Signup and view all the answers

    What is the characteristic of logistic growth that differentiates it from geometric growth?

    <p>Growth stabilizes over time due to carrying capacity</p> Signup and view all the answers

    What is the primary purpose of the lag phase in logistic growth?

    <p>To acclimatize the population</p> Signup and view all the answers

    Which factor directly influences a population proportionally to its size?

    <p>Predation</p> Signup and view all the answers

    What is a common application of quadrat sampling in estimating population size?

    <p>Direct counting</p> Signup and view all the answers

    During which phase does logistic growth exhibit a potential decline if resources are not sustainable?

    <p>Death/extinction phase</p> Signup and view all the answers

    What is the impact of immigration on a population?

    <p>Leads to the establishment of sub-populations</p> Signup and view all the answers

    In population dynamics, what does fertility specifically refer to?

    <p>The capability of females to produce offspring</p> Signup and view all the answers

    What characterizes a stable population?

    <p>A zero growth rate and balance with environmental carrying capacity</p> Signup and view all the answers

    Why is migration considered a critical survival strategy for some species?

    <p>To avoid resource depletion in one area</p> Signup and view all the answers

    What happens when a population exceeds its carrying capacity?

    <p>Resource depletion and subsequent population decline</p> Signup and view all the answers

    Which of the following represents a type of population movement linked to individual behaviors?

    <p>Migration</p> Signup and view all the answers

    What role do environmental resistance factors play in population dynamics?

    <p>Limit the biotic potential and growth of a population</p> Signup and view all the answers

    How does emigration differ from migration in a population context?

    <p>Migration refers to permanent departure from a population</p> Signup and view all the answers

    What directly impacts the natality rate within a population?

    <p>Fertility of females</p> Signup and view all the answers

    Why is carrying capacity important in understanding population dynamics?

    <p>Defines the maximum sustainable population size in an ecosystem</p> Signup and view all the answers

    What contributes to the natality rate within a population?

    <p>Fertility</p> Signup and view all the answers

    What defines the maximum number of individuals that an ecosystem can sustain without significant negative impacts?

    <p>Carrying capacity</p> Signup and view all the answers

    What type of movement refers to the permanent departure of individuals from a population?

    <p>Emigration</p> Signup and view all the answers

    What are the limiting factors that reduce the biotic potential and growth of a population collectively known as?

    <p>Environmental resistance</p> Signup and view all the answers

    What is a critical survival strategy involving the periodic movement of organisms to a different location?

    <p>Migration</p> Signup and view all the answers

    When does a population exceed its carrying capacity, leading to resource depletion?

    <p>When it surpasses its maximum sustainable size</p> Signup and view all the answers

    What differentiates a stable population from an unstable one?

    <p>Growth rate</p> Signup and view all the answers

    Which type of factor influences a population regardless of its size?

    <p>Density-independent factor</p> Signup and view all the answers

    In logistic growth, what phase is characterized by a potential decline if the population cannot sustain its resource use?

    <p>Death/extinction phase</p> Signup and view all the answers

    Which method of determining population size relies on statistical methods to infer total population size from sampled individuals?

    <p>Indirect Counting</p> Signup and view all the answers

    What type of growth indicates rapid exponential growth until resource limits halt expansion?

    <p>Geometric Growth</p> Signup and view all the answers

    In population dynamics, what is the primary characteristic of geometric growth?

    <p>Doubling of population size each generation</p> Signup and view all the answers

    Which activity uses marked samples to estimate the total population based on marked to unmarked proportions?

    <p>Mark-Recapture Studies</p> Signup and view all the answers

    What is the distinguishing feature of the equilibrium phase in logistic growth?

    <p>Population stabilization around carrying capacity</p> Signup and view all the answers

    Which method is effective for estimating population density in a defined area, particularly for stationary organisms?

    <p>Quadrat Sampling</p> Signup and view all the answers

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