Pre AP Biology -ECO 2.2 Population Growth- MCQ Exam Style Questions -New Syllabus

Pre AP Biology -ECO 2.2 Population Growth- MCQ Exam Style Questions – New Syllabus 2025-2026

Pre AP Biology -ECO 2.2 Population Growth- MCQ Exam Style Questions – Pre AP Biology – per latest Pre AP Biology Syllabus.

Pre AP Biology – MCQ Exam Style Questions- All Topics

Question

Which one of these statements is most likely a reason that human populations have sidestepped factors that usually control population growth?

a. Agriculture and industrialization have increased the carrying capacity for our species.

b. The population growth rate ($r$) for the human population has always been small.

c. The age structure of human populations has no impact on its population growth.

d. Plagues have killed off large numbers of humans at certain times in the past.

▶️ Answer/Explanation

Detailed solution

The correct answer is a.
In ecology, the carrying capacity ($K$) is the maximum population size an environment can sustain.
Humanity has used technology to artificially expand this limit.
Agriculture provided a stable food supply, allowing for higher density living.
Industrialization improved medicine, sanitation, and resource distribution.
These advancements reduced density-dependent deaths that normally limit growth.
Consequently, the human population has maintained exponential growth for an extended period.

Question

Which of these examples might reflect density-dependent regulation of population size?

a. An exterminator uses a pesticide to eliminate carpenter ants from a home.

b. Mosquitoes disappear from an area after the first frost.

c. Northeast storms blow over and kill all willow trees along a lake.

d. A clam population declines in numbers in a bay as the number of predatory herring gulls increases.

▶️ Answer/Explanation

Correct Option: d

Detailed solution

Density-dependent factors are those whose effects on the size or growth of the population vary with the population density.
Predation is a classic density-dependent factor because as a prey population grows, it attracts more predators.
In option d, the clam population decline is tied to the biological interaction with predatory gulls.
Options a, b, and c represent density-independent factors like weather or human intervention.
These abiotic factors kill individuals regardless of how many are present in the $1$ given area.
Therefore, only the predator-prey relationship reflects density-dependent regulation.

Question

Suppose that you observe an animal that gives birth to many young, but does not care for them. Which survivorship curve is it most likely that this animal represents?

a. type $I$ or type $II$
b. type $II$ or type $III$
c. type $I$
d. type $III$

▶️ Answer/Explanation

Detailed solution

The correct answer is d. type $III$.
Type $III$ curves characterize organisms that produce a large number of offspring.
These species typically provide little to no parental care for their young.
As a result, there is a very high mortality rate early in life.
The few individuals that survive the early stages tend to live for a long time.
Common examples include many fish species, marine invertebrates, and plants.

Pre AP Biology -ECO 2.2 Population Growth- MCQ Exam Style Questions -New Syllabus