Question 1

A population of birds is found only in a narrow coastal region of California. Which of the following best explains why this species is not found in other habitats, despite similar climates elsewhere?

Accepted Answer

The species' actual range is limited by both biotic and abiotic factors, such as competition and specific habitat requirements.

Question 2

Which of the following best describes the difference between evolutionary and ecological factors in limiting species distribution?

Accepted Answer

Evolutionary factors involve genetic adaptation over generations, while ecological factors involve immediate interactions with the environment.

Question 3

Dispersal is a key concept in population ecology. Which scenario best illustrates how dispersal limits a species' distribution?

Accepted Answer

A mountain range prevents a frog species from reaching suitable habitats on the other side.

Question 4

Which of the following is an example of a biotic factor affecting a species' distribution?

Accepted Answer

Competition with another species for food resources.

Question 5

Which of the following is NOT an abiotic factor that impacts species distribution?

Accepted Answer

Predation by a native carnivore.

Question 6

A population of deer is observed to have a clumped dispersion pattern. Which of the following is the most likely explanation for this pattern?

Accepted Answer

Resources such as food and water are unevenly distributed, causing individuals to aggregate.

Question 7

Which process does NOT directly increase the size of a population?

Accepted Answer

Emigration

Question 8

A life table is used to study populations. What information does a survivorship curve derived from a life table provide?

Accepted Answer

The proportion of individuals surviving at each age.

Question 9

Which of the following best describes exponential population growth?

Accepted Answer

Population increases by a constant proportion each generation, as described by $$ \frac{dN}{dt} = rN $$

Question 10

Why can't a population sustain exponential growth indefinitely?

Accepted Answer

Resources become limited, leading to increased competition and other density-dependent factors.

Question 11

The logistic growth model is described by the equation $$ \frac{dN}{dt} = rN \left(1 - \frac{N}{K}\right) . $$What does $$ K $$ represent in this equation?

Accepted Answer

The carrying capacity, or the maximum population size the environment can sustain.

Question 12

A population of rabbits overshoots its carrying capacity ($$ K ). $$What is the most likely outcome?

Accepted Answer

The population will decrease due to resource depletion and increased mortality.

Question 13

Which of the following is a characteristic of an r-selected species?

Accepted Answer

Produces many offspring with little parental care.

Question 14

Which of the following is an example of a density-independent limiting factor?

Accepted Answer

A hurricane destroys a coastal bird population regardless of its size.

Question 15

Which of the following best describes a metapopulation?

Accepted Answer

A group of spatially separated populations of the same species that interact through migration.

Question 16

A population of insects experiences a sudden drop in numbers due to a pesticide application, but quickly rebounds. Which survivorship curve type does this most likely represent?

Accepted Answer

Type III, where most individuals die young but survivors reproduce rapidly.

Question 17

Which of the following scenarios best illustrates density-dependent regulation of population size?

Accepted Answer

As a fish population grows, competition for food increases, leading to lower birth rates.

Question 18

Which of the following is NOT a main component of life history in population ecology?

Accepted Answer

Migration patterns

Question 19

A population of mice has a birth rate of 0.2 per individual per year and a death rate of 0.1 per individual per year. If the population size is 500, what is the expected change in population size per year under exponential growth? Use $$ \frac{dN}{dt} = rN $$, where $$ r = $$ birth rate $$ - $$ death rate.

Accepted Answer

$$ \frac{dN}{dt} = (0.2 - 0.1) 	imes 500 = 50 $$

Question 20

Which of the following best summarizes the concept of population dynamics?

Accepted Answer

The study of how and why population sizes change over time due to births, deaths, immigration, and emigration.

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