540 MHR • Unit 5 Population Dynamics
REVIEW
UNIT 5
Multiple Choice
In your notebook, write the letter of the best
answer for each of the following questions.
1.The role played by a particular population in
a community is referred to as its
(a)habitat
(b)biome
(c)ecological niche
(d)range
(e)trophic structure
2.In any community, a species that is a herbivore
is probably a
(a)primary producer
(b)primary consumer
(c)secondary consumer
(d)tertiary consumer
(e)terrestrial organism
3.The number of individuals at each trophic
level in an ecosystem can be represented by a
(a)pyramid of numbers
(b)food web
(c)biomass pyramid
(d)pyramid of productivity
(e)biological magnification
4.In biogeochemical cycles, the processes of
photosynthesis and respiration move materials
(a)out of an abiotic reservoir in which
elements are unavailable to organisms
(b)between abiotic and biotic reservoirs in
which nutrients are accessible to living
things
(c)between a biotic reservoir in which
elements are unavailable to organisms to
another biotic reservoir in which elements
are accessible
(d)between different abiotic reservoirs
(e)between different biotic reservoirs
5.For a population that is not growing but is
stable in size, the following is true.
(a)the replacement rate (R) is two
(b)the growth rate (r) of the population is one
(c)the population is in Stage 2 or 3 of the
demographic transition
(d)the replacement rate (R) is one
(e)the growth rate (r) is positive
6.Logistic population growth
(a)occurs in unlimited environments
(b)produces a J-shaped curve when graphed(c)is slow to begin with, but then speeds up
and remains high until some abiotic factor
reduces population size
(d)is regulated by density-dependent factors,
such as competition between individuals
for limited resources
(e)is not affected by the carrying capacity of
the environment
7.Species with equilibrial (K-selected) life
histories typically
(a)have low juvenile mortality
(b)have several reproductive events during
a lifetime
(c)produce single or a few offspring at each
reproductive event
(d)have relatively long life spans
(e)all of the above
8.After a country has passed through a
demographic transition (that is, completed
Stage 4 of the transition), its population
will likely
(a)be smaller than it was before it started the
transition
(b)have a birth rate that is higher than its
death rate
(c)be the same size as it was before it started
the transition
(d)be poorer than it was before it started the
transition
(e)be larger than it was before it started the
transition; and have birth and death rates
that are about equal
9.Human activity
(a)can decrease the carrying capacity of Earth
for humans
(b)has an effect on the carrying capacity of
Earth for non-human organisms
(c)can increase the carrying capacity of Earth
for humans
(d)both (a) and (b) are true
(e)(a), (b), and (c) are true
10.Gases produced by the combustion of gasoline
and released in the exhaust of vehicles
contribute to
(a)the production of photochemical smog
(b)depletion of the ozone layer
(c)the greenhouse effect
(d)acid precipitation
(e)(a), (c), and (d)UNDERSTANDING CONCEPTS