populations
The struggle between organisms to survive in a habitat with limited resources is called
a.competition.
b.predation.
c.symbiosis.
d.parasitism.
competition
Demographers collect and study data about the age structure, geographic distribution, and ____________________ of human populations.
Growth rate
The scientific study of human populations is called ____.
a.immigration
b.emigration
c. demographic transition
d.demography
demography
Density-independent factors are limiting factors whose effects are ____.
a.confined to the habitat of the population
b.determined by the degree of competition for resources
c.not influenced by population densities
d.determined by the difference between birthrate and population density
not influenced by population densities
The place where an organism lives and that provides the things the organism needs is called its
a.habitat.
b.population.
c.species.
d.community.
habitat
When a jellyfish paralyzes a tiny fish with its poisonous tentacles, the fish is the
a.predator.
b.prey.
c.host.
d.parasite.
Instead of growing explosively, population growth tends to level off because the population reaches the ____________________ of a particular environment.
carrying capacity
The movement of individuals into an area is called ____.
a.demography
b.immigration
c. carrying capacity
d. emigration
immigration
For a particular species, the carrying capacity is the maximum number of individual organisms that ____.
a.the species could reach in a given time period if all the offspring survive and reproduce
b.could be supported by a given environment indefinitely
c.are in their post-reproductive years
d.could be supported by any environment over a period of one year
could be supported by a given environment indefinitely
If you count 20 beetles in a garden measuring 5 square meters, the population density of the beetles is
a.100 beetles per square meter.
b.20 beetles per square meter.
c.5 beetles per square meter.
d.4 beetles per square meter.
4
An early winter frost preventing further growth in a tomato garden is an example of
a.carrying capacity.
b.a limiting factor.
c.a biotic factor.
d.indirect observation.
a limiting factor
The number of offspring produced by a female during her reproductive years defines the ____________________ rate.
fertility
The number of individuals of a single species per unit area is known as ____.
a.carrying capacity
b.limiting population
c.population density
d.logistic population
population density
When you study all the growth characteristics of a human population, you are studying its ____.
a.reproductive pattern
b.exponential growth
c.life-history pattern
d.demography
demography
The largest population that an environment can support is called its
a.carrying capacity.
b.limiting factor.
c.birth rate.
d.death rate.
carrying capacity
All of the following are examples of limiting factors EXCEPT
a.food.
b.soil.
c.space.
d.weather conditions.
soil
Food, water, or shelter could be density- ____________________ factors on the growth of a population
dependent
Bacteria employ a(n) ____reproductive strategy, a characteristic determined by their small size, rapid maturation, and short life span.
a.unusual
b.early
c.rapid
d.slow
rapid
Population control factors whose effects increase as the size of the population increases are ____.
a.abiotic factors
b.density-dependent factors
c.limiting factors
d.density-independent factors
b.density-dependent factors
A(n) ____________________-shaped curve describes the tendency of a population to grow without limit to its size.
J
What is biodiversity?
the total of all the variety of organisms in a specific area
A population of bacteria that doubles its size every 20 minutes exhibits ____________________ growth.
exponential
A population that grows until it reaches its carrying capacity usually has the shape of an ____.
a.I
b.J
c.S
d.M
s
Which of the following is a biotic factor in the prairie ecosystem?
a.water
b.sunlight
c.soil
d.grass
grass
The ____________________ method of estimating involves multiplying the number of organisms in a small area to find the number in a larger area.
sampling