Question 1

Which of the following best describes the demographic transition in human populations?

Accepted Answer

A period when death rates decline before birth rates, resulting in rapid population growth.

Question 2

Refer to the graph showing birth and death rates over time. What does the area between the birth rate and death rate curves represent?

Accepted Answer

The rate of population increase per 1,000 individuals.

Question 3

Which equation correctly represents the rate of change in population size ($$dN/dt) $$for a population?

Accepted Answer

$$dN/dt = rN$$

Question 4

In the context of population ecology, which of the following is a density-dependent factor?

Accepted Answer

Competition for food among individuals of the same species.

Question 5

A population of aphids shows exponential growth in spring followed by a sudden decline in summer. Which factor most likely explains the sudden decline?

Accepted Answer

Increased predation or resource depletion as population density rises.

Question 6

In the song sparrow graph, as the density of females increases, the mean number of offspring per female decreases. What does this illustrate?

Accepted Answer

Density-dependent reduction in reproductive success.

Question 7

Which of the following best explains why proportional mortality of kelp perch increases with perch density?

Accepted Answer

Predators become more efficient as prey density increases, a density-dependent effect.

Question 8

Which of the following is an example of a density-independent factor affecting population growth?

Accepted Answer

A drought reducing water availability for all individuals.

Question 9

The lynx and snowshoe hare population cycles are best explained by which ecological interaction?

Accepted Answer

Predator-prey dynamics

Question 10

If a population is at equilibrium ($$dN/dt = 0$$), which of the following must be true?

Accepted Answer

Birth rate equals death rate.

Question 11

Which of the following scenarios best illustrates the concept of carrying capacity ($$K$$)?

Accepted Answer

A population grows rapidly and then stabilizes as resources become limited.

Question 12

Which of the following is NOT a density-dependent factor?

Accepted Answer

Flooding

Question 13

During the demographic transition, why does population growth accelerate before eventually stabilizing?

Accepted Answer

Death rates decrease before birth rates, creating a gap that leads to rapid growth.

Question 14

Which of the following equations describes a population at carrying capacity?

Accepted Answer

$$dN/dt = rN \left(1 - \frac{N}{K}\right)$$

Question 15

A population of mice in a barn is limited by food availability, disease, and predation. Which of these is a density-independent factor?

Accepted Answer

A sudden cold snap killing many mice

Question 16

Which of the following best explains why urbanization often leads to demographic transition?

Accepted Answer

Urbanization is associated with improved healthcare, reducing death rates before birth rates decline.

Question 17

If a population of kelp perch increases in density and experiences higher proportional mortality, what type of regulation is this?

Accepted Answer

Density-dependent regulation

Question 18

Which of the following is a likely outcome if a population exceeds its carrying capacity ($$K$$)?

Accepted Answer

The population will experience increased mortality and decreased birth rates until it returns to $$K.$$

Question 19

Which of the following best describes the relationship between snowshoe hare and lynx populations?

Accepted Answer

Hare populations increase first, followed by lynx populations.

Question 20

Which of the following is an example of an intrinsic factor regulating population growth?

Accepted Answer

Territorial behavior limiting reproduction

Population Ecology: Demographic Transitions and Control of Population Growth

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