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How Populations Grow
Limits to Growth
Human Population Growth
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100
Which of the following tells you popluation density? A) the number of births per year. B) the number of frogs in a pond. C) the number of deaths per year. D) the number of bacteria per square millimeter.
D) the number of bacteria per square millimeter.
100
If a population grows larger than the carrying capacity of the environment, the... A) death rate may rise. B) birthrate may rise. C) death rate must fall. D) birthrate must fall.
A) death rates may rise.
100
About 500 years ago, the world's population started what?
Growing more rapidly.
100
Humans spraying an inseticide to kill mosquitoes is an example of what?
A density-independent limiting factor.
100
What letter represents exponential growth?
J
200
Which of the following is NOT one of the factors that play a role in popluation growth rate? A) immigration. B) death rate. C) emigration. D) demography
D) demography
200
Water lillies do not grow in desert sand because water availability to these plants in a desert is a...
Limiting factor.
200
Countries in the first stage of demographic transition have what?
A high death rate and a high birthrate.
200
What happens in stage 2 of the demographic transition?
The death rate begins to fall.
200
What can weaken an organisms ability to resist disease?
Stress from overcrowding.
300
If immigration and emigration numbers remain equal, which is the most important contributing factor to a slowed growth rate? A) increased birthrate. B) constant death rate. C) decreased birthrate. D) constant birthrate.
C) decreased birthrate.
300
Which would be least likely to be affected by a density-dependent limiting factor? A) a small, scattered population. B) a population with a high birthrate. C) a large, dense population. D) a population with a high immigration rate.
A) a small, scattered population.
300
The anticipated human population by the year 2050 is about what?
9 billion.
300
Humans overfishing cod causing their population to fall is an example of what?
A density-dependent limiting factor.
300
What letter respresents logistical growth?
S
400
Which factor might NOT contribute to an exponential growth rate in a given population? A) lower death rates. B) higher birthrates. C) less competition. D) reduced resources.
D) reduced resources.
400
The eruption of a volcano is an example of what?
A density-independent limiting factor.
400
In countries like India, the human population is growing... how?
Exponentially
400
If an age-structure diagram shows more teenagers than adults, what can you assume?
That the population will grow rapidly.
400
What happens in stage 3 of the demographic transition?
The birthrate falls to meet the death rate.
500
In a logistic growth curve, what is the phase when the population grows quickly?
Exponential growth.
500
What is a limiting factor?
A factor that controls the growth of a population.
500
What is demography?
The scientific study of human populations.
500
Why is parasitism a density-dependent factor?
The denser the population, the easier parasites can spread.
500
What triggered rapid, exponential human growth in the 1800s?
The industrial revolution.