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WorksheetsUnit 4: Populations
Total questions: 17
Worksheet time: 9mins
The movement of organisms into a range is called
immigration.
emigration.
population shift.
carrying capacity.
Something that controls the growth or size of a population is
a growth factor.
a limiting factor.
the carrying capacity.
the growth rate.
Demography is the scientific study of
parasitism and disease.
human populations.
modernized countries.
none of the above.
The pattern of spacing between individuals across the range of a population is its
distribution.
growth rate.
density.
habitat.
About 500 years ago, the world's population started
decreasing.
growing more rapidly.
to reach carrying capacity.
to level off.
The human population experienced exponential growth just after
plowing and irrigation began.
the bubonic plague began.
agriculture began.
the Industrial Revolution began.
Which of the following could describe a population that is decreasing in size?
The birthrate and the death rate remain the same.
The death rate is becoming lower than the birthrate.
The death rate is constant and the birthrate is increasing.
The death rate is becoming higher than the birthrate?
In a logistic growth curve, exponential growth is the phase in which the population
grows quickly.
reaches carrying capacity.
growth begins to slow down.
growth stops.
If a population grows larger than the carrying capacity of the environment, which of these is most likely to happen?
The death rate may rise.
The birthrate may rise.
The death rate must fall.
The birthrate must fall.
Demographic transition is change from high birthrates and high death rates to
low birthrates and low death rates.
exponential growth.
low birthrates and high death rates.
indefinite growth.
Which is a biotic factor that affects the size of a population in a specific ecosystem?
number and kinds of predators in the ecosystem.
average temperature of the ecosystem.
type of soil in the ecosystem.
concentration of oxygen in the ecosystem.
During a long period when there is no rainfall, a mountain lion may temporarily leave its usual hunting territory to drink from a farm pond. This behavior is due to
the change in an abiotic factor in its environment.
its need to find different foods to eat.
its need to find a new habitat.
the change in a biotic factor in its environment.
There are 150 Saguaro cactus plants per square kilometer in a 10-square-kilometer area of Arizona desert. To which population characteristic does this information refer?
age structure
growth rate
population density
geographic range
The graph above shows the growth of a bacterial population. Which of the following correctly describes the growth curve?
logistic
limiting
demographic
exponential
Which of the following is a density-independent limiting factor?
disease
earthquake
emigration
parasitism
Suppose that a species of toad is introduced into a new environment in an attempt to reduce the population of insects. The toad has no natural predators in the new environment. The toad population would most likely
increase logistically.
increase exponentially.
decrease rapidly and die out.
remain the same.
Sea otters live in the ocean. Which of the following is NOT likely to be a limiting factor on the sea otter population?
drought
predation
disease
competition
