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AP Environmental Science Practice Quiz: Human Population Dynamics

Written by AP Content Team, Verified for 2026 AP Exams, Last updated: May 2026

Test your understanding with short quizzes. This quiz has 11 questions to check your progress.

Question 1 of 11

A country's population is growing at an annual rate of 3.5%. According to the rule of 70, approximately how many years will it take for this country's population to double?

All Questions (11)

A country's population is growing at an annual rate of 3.5%. According to the rule of 70, approximately how many years will it take for this country's population to double?

A) 10 years

B) 20 years

C) 35 years

D) 70 years

Correct Answer: B

The rule of 70 states that the doubling time of a population can be approximated by dividing 70 by the percentage growth rate. In this case, 70 / 3.5 = 20 years.

An outbreak of a highly contagious virus leads to a significant increase in the death rate in a densely populated city, while sparsely populated rural areas are largely unaffected. This pattern suggests the virus is acting as which type of limiting factor?

A) A density-independent factor

B) A density-dependent factor

C) A Malthusian factor

D) A carrying capacity factor

Correct Answer: B

The content identifies disease transmission as a density-dependent factor. The impact of the virus is more severe in the high-density urban area, demonstrating that its effect is dependent on population density.

Which of the following sets of conditions would most likely lead to a decline in a human population's growth rate?

A) Low infant mortality, high birth rates, and improved nutrition

B) Decreased access to family planning and early marriage age

C) Increased access to education, widespread family planning, and postponement of marriage

D) High birth rates, high death rates, and poor nutrition

Correct Answer: C

The provided text states that access to education, access to family planning, and postponement of marriage are all factors that affect population growth. These specific factors are known to lower birth rates, thus causing a decline in the population growth rate.

Malthusian theory posits that human population growth is fundamentally limited by which of the following?

A) The rate of technological innovation

B) The occurrence of density-independent events like storms

C) The finite availability of resources, such as food

D) The effectiveness of global family planning initiatives

Correct Answer: C

The content specifies that Malthusian theory sets forth basic factors that limit human population growth. The core of this theory is that population tends to grow exponentially while resources (like food) grow arithmetically, creating a natural limit.

A massive earthquake strikes a coastal region, causing widespread destruction and loss of life regardless of how crowded the settlements are. This earthquake is an example of what kind of limiting factor?

A) Density-dependent

B) Density-independent

C) Carrying capacity

D) Malthusian

Correct Answer: B

The content lists major storms, fires, heat waves, or droughts as density-independent factors. A major earthquake fits into this category of a natural disaster whose impact is not determined by the population density of the affected area.

The 'rule of 70' is a calculation used in population studies to estimate the...

A) total fertility rate of a population.

B) carrying capacity of an ecosystem.

C) doubling time of a population.

D) infant mortality rate.

Correct Answer: C

The provided content explicitly states that the rule of 70 'approximates the population's doubling time' by dividing 70 by the percentage population growth rate.

Which of the following is the best example of a density-dependent factor limiting a city's population growth?

A) A record-breaking heat wave affecting the entire region.

B) A flash flood that inundates the city's low-lying areas.

C) Limited availability of housing and territory within the city limits.

D) A severe fire season caused by regional drought conditions.

Correct Answer: C

The content lists territory size as a density-dependent factor. As a city's population grows and becomes denser, the lack of available space and housing becomes a more significant factor limiting further growth.

All of the following are listed as factors that directly influence whether a human population is growing or declining EXCEPT:

A) Overall death rates

B) Access to good nutrition

C) The Earth's carrying capacity

D) Infant mortality rates

Correct Answer: C

While the Earth's carrying capacity is a factor that limits the global human population, the other options (death rates, nutrition, infant mortality) are listed as direct factors that affect the growth or decline dynamics within a specific population.

If a population's doubling time is calculated to be 14 years using the rule of 70, what is its percentage growth rate?

A) 2%

B) 5%

C) 7%

D) 14%

Correct Answer: B

The rule of 70 can be rearranged to find the growth rate: Percentage Growth Rate = 70 / Doubling Time. Therefore, 70 / 14 years = 5%.

The concept that the total global human population is ultimately constrained by the planet's resource limits is known as:

A) The rule of 70

B) A density-dependent factor

C) The Earth's carrying capacity

D) A density-independent factor

Correct Answer: C

The content explicitly states that 'Factors limiting global human population include the Earth's carrying capacity.' This concept refers to the maximum population size that the environment can sustain indefinitely.

A developing nation begins a successful public health campaign that dramatically lowers its infant mortality rate. Without any other changes, what is the most immediate and likely effect on the nation's population?

A) The population growth rate will decrease.

B) The population will begin to decline.

C) The population growth rate will increase.

D) The population's doubling time will increase.

Correct Answer: C

The content lists infant mortality rates as a factor affecting population growth. A lower infant mortality rate means more individuals survive to reproductive age, which, holding other factors like birth rate constant, will lead to an increase in the population growth rate.