APES Unit 3 Progress Check MCQ Questions
and Answers
1. Which of the following best describes carrying capacity?
A. The maximum number of individuals an ecosystem can support indefinitely
B. The maximum number of individuals a population can sustain without degrading
resources
B. The number of individuals that can migrate into a population
C. The number of individuals that can be supported during exponential growth
Rationale: Carrying capacity refers to the sustainable limit of a population based on
resource availability.
2. Which population growth model shows rapid increase followed by leveling off at
carrying capacity?
A. Exponential growth
B. Logistic growth
B. Linear growth
C. Declining growth
Rationale: Logistic growth incorporates environmental limits, producing an S-shaped
curve.
3. Which of the following organisms would be classified as an r-strategist?
A. Elephants
B. Humans
C. Mice
C. Whales
Rationale: r-strategists reproduce quickly, have many offspring, and thrive in unstable
environments.
4. Which factor most directly affects population density?
A. Genetic diversity
B. Availability of resources
B. Predator-prey cycles
C. Climate change
Rationale: Resource availability (food, water, shelter) determines how many individuals
can live in a given area.
5. Which of the following is an example of density-dependent population control?
A. Natural disasters
B. Seasonal temperature changes
C. Competition for food
C. Habitat destruction
Rationale: Density-dependent factors intensify as population size increases, such as
,competition, predation, or disease.
6. Which type of survivorship curve is typical of humans?
A. Type I
B. Type II
C. Type III
D. Type IV
Rationale: Humans show high survival rates early and mid-life, with mortality increasing
in older age (Type I curve).
7. Which of the following best explains why populations cannot grow indefinitely?
A. Immigration and emigration balance growth
B. Predators always limit population size
C. Limiting factors such as food, water, and space restrict growth
C. Populations naturally decline after exponential growth
Rationale: Limiting factors prevent indefinite growth, enforcing carrying capacity.
8. Which of the following best describes a K-strategist species?
A. Produces many offspring with little parental care
B. Produces few offspring with high parental investment
B. Exhibits rapid population growth in unstable environments
C. Has short lifespans and early reproductive maturity
Rationale: K-strategists (like elephants) invest heavily in fewer offspring, maximizing
survival.
9. Which of the following is a density-independent factor?
A. Competition for food
B. Spread of disease
C. Natural disasters (e.g., hurricanes)
C. Predation
Rationale: Density-independent factors affect populations regardless of size.
10. Which biome has the highest net primary productivity?
A. Desert
B. Tundra
C. Tropical rainforest
C. Grassland
Rationale: Tropical rainforests have abundant rainfall, sunlight, and biodiversity.
11. Which of the following is most likely to reduce population growth rates?
A. Increased fertility rates
B. Increased education for women
B. Increased infant survival rates
C. Increased food availability
Rationale: Education for women correlates with lower fertility and slower growth.
, 12. Which survivorship curve is typical of oysters?
A. Type I
B. Type II
C. Type III
C. Type IV
Rationale: Oysters produce many offspring, most of which die early.
13. Which of the following best explains why populations fluctuate around carrying
capacity?
A. Immigration stabilizes population size
B. Resource availability varies over time
B. Predator-prey cycles remain constant
C. Populations always decline after exponential growth
14. Which of the following countries is most likely in Stage 2 of the demographic
transition model?
A. United States
B. Japan
C. Nigeria
C. Germany
Rationale: Stage 2 = high birth rates, declining death rates, rapid growth.
15. Which factor most directly influences infant mortality rates?
A. Climate
B. Population density
C. Access to healthcare
C. Urbanization
16. Which of the following is an example of exponential growth?
A. Human population growth in the 21st century
B. Logistic growth of deer populations
C. Linear increase in crop yields
D. Decline in predator populations
17. Which of the following is a consequence of overshooting carrying capacity?
A. Stable population growth
B. Resource depletion and population crash
B. Increased biodiversity
C. Reduced competition
18. Which of the following best describes replacement-level fertility?
A. Fertility rate needed for exponential growth
B. Fertility rate needed to maintain population size
B. Fertility rate needed to double population size
C. Fertility rate needed for zero infant mortality
and Answers
1. Which of the following best describes carrying capacity?
A. The maximum number of individuals an ecosystem can support indefinitely
B. The maximum number of individuals a population can sustain without degrading
resources
B. The number of individuals that can migrate into a population
C. The number of individuals that can be supported during exponential growth
Rationale: Carrying capacity refers to the sustainable limit of a population based on
resource availability.
2. Which population growth model shows rapid increase followed by leveling off at
carrying capacity?
A. Exponential growth
B. Logistic growth
B. Linear growth
C. Declining growth
Rationale: Logistic growth incorporates environmental limits, producing an S-shaped
curve.
3. Which of the following organisms would be classified as an r-strategist?
A. Elephants
B. Humans
C. Mice
C. Whales
Rationale: r-strategists reproduce quickly, have many offspring, and thrive in unstable
environments.
4. Which factor most directly affects population density?
A. Genetic diversity
B. Availability of resources
B. Predator-prey cycles
C. Climate change
Rationale: Resource availability (food, water, shelter) determines how many individuals
can live in a given area.
5. Which of the following is an example of density-dependent population control?
A. Natural disasters
B. Seasonal temperature changes
C. Competition for food
C. Habitat destruction
Rationale: Density-dependent factors intensify as population size increases, such as
,competition, predation, or disease.
6. Which type of survivorship curve is typical of humans?
A. Type I
B. Type II
C. Type III
D. Type IV
Rationale: Humans show high survival rates early and mid-life, with mortality increasing
in older age (Type I curve).
7. Which of the following best explains why populations cannot grow indefinitely?
A. Immigration and emigration balance growth
B. Predators always limit population size
C. Limiting factors such as food, water, and space restrict growth
C. Populations naturally decline after exponential growth
Rationale: Limiting factors prevent indefinite growth, enforcing carrying capacity.
8. Which of the following best describes a K-strategist species?
A. Produces many offspring with little parental care
B. Produces few offspring with high parental investment
B. Exhibits rapid population growth in unstable environments
C. Has short lifespans and early reproductive maturity
Rationale: K-strategists (like elephants) invest heavily in fewer offspring, maximizing
survival.
9. Which of the following is a density-independent factor?
A. Competition for food
B. Spread of disease
C. Natural disasters (e.g., hurricanes)
C. Predation
Rationale: Density-independent factors affect populations regardless of size.
10. Which biome has the highest net primary productivity?
A. Desert
B. Tundra
C. Tropical rainforest
C. Grassland
Rationale: Tropical rainforests have abundant rainfall, sunlight, and biodiversity.
11. Which of the following is most likely to reduce population growth rates?
A. Increased fertility rates
B. Increased education for women
B. Increased infant survival rates
C. Increased food availability
Rationale: Education for women correlates with lower fertility and slower growth.
, 12. Which survivorship curve is typical of oysters?
A. Type I
B. Type II
C. Type III
C. Type IV
Rationale: Oysters produce many offspring, most of which die early.
13. Which of the following best explains why populations fluctuate around carrying
capacity?
A. Immigration stabilizes population size
B. Resource availability varies over time
B. Predator-prey cycles remain constant
C. Populations always decline after exponential growth
14. Which of the following countries is most likely in Stage 2 of the demographic
transition model?
A. United States
B. Japan
C. Nigeria
C. Germany
Rationale: Stage 2 = high birth rates, declining death rates, rapid growth.
15. Which factor most directly influences infant mortality rates?
A. Climate
B. Population density
C. Access to healthcare
C. Urbanization
16. Which of the following is an example of exponential growth?
A. Human population growth in the 21st century
B. Logistic growth of deer populations
C. Linear increase in crop yields
D. Decline in predator populations
17. Which of the following is a consequence of overshooting carrying capacity?
A. Stable population growth
B. Resource depletion and population crash
B. Increased biodiversity
C. Reduced competition
18. Which of the following best describes replacement-level fertility?
A. Fertility rate needed for exponential growth
B. Fertility rate needed to maintain population size
B. Fertility rate needed to double population size
C. Fertility rate needed for zero infant mortality
