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 (C)</p> Signup and view all the answers

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

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

What leads to resource depletion and subsequent population decline?

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

Which factor involves individuals permanently leaving a population?

<p>Emigration (C)</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. (A)</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 (B)</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 (D)</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 (C)</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 (D)</p> Signup and view all the answers

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

<p>Disease (D)</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 (C)</p> Signup and view all the answers

Why is direct counting useful for large or sessile organisms?

<p>It allows for counting individuals directly (D)</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. (D)</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 (A)</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 (C)</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 (A)</p> Signup and view all the answers

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

<p>Rapid exponential growth (D)</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 (A)</p> Signup and view all the answers

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

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

Which factor directly influences a population proportionally to its size?

<p>Predation (D)</p> Signup and view all the answers

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

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

What is the impact of immigration on a population?

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

In population dynamics, what does fertility specifically refer to?

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

What characterizes a stable population?

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

What happens when a population exceeds its carrying capacity?

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

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

<p>Migration (C)</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 (D)</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 (D)</p> Signup and view all the answers

What directly impacts the natality rate within a population?

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

What contributes to the natality rate within a population?

<p>Fertility (A)</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 (A)</p> Signup and view all the answers

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

<p>Emigration (C)</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 (B)</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 (B)</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 (B)</p> Signup and view all the answers

What differentiates a stable population from an unstable one?

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

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

<p>Density-independent factor (C)</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 (A)</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 (B)</p> Signup and view all the answers

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

<p>Geometric Growth (C)</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 (D)</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 (B)</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 (C)</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 (D)</p> Signup and view all the answers

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