Unit 3 Populations APES Exam Review Q’s and A’s
Write an equation for the rule of 70. What is it used for? - -D.T. = 70/ growth rate (r)
-What are the four factors used to determine population growth? What is the equation? - -
Births-increase size, Deaths-decrease size, immigration-increase size, emigration-decrease
size Population change= (births+immigration)- (deaths + emigration) Growth rate (r )= per
capita birth rate-per capita death rate
-From the equation in #3, what factors add organisms to a population? Which ones remove
organisms from a population? - -Organism size, energy used to make each individual,
number of offspring produced, timing of maturation, life expectancy, lifetime reproductive
events, survivorship curve
-What is population momentum? - -consequence of the demographic transition, explains
why a population will continue to grow even if the fertility rate declines
-List two characteristics of an r-selected species. - -a) spend most of their time in
Exponential growth (J shaped curve)
b) maximize the reproductive rate
-List two characteristics of a K-selected species. - -a) low death rate, live to old age
b) maintain their population levels at K
-A Whooping Crane is a __________ (r or k selected species) and it is endangered because of
the following: - -K, number of birds released has been small and they are too young for
breeding
-A California Condor is a ______ (r or k selected species) and it is endangered because of the
following: - -K, population is threatened by poison ingestion, illegal egg collection, habitat
loss, and power lines
-An Orangutan is a ____ (r or k selected species) and it is endangered because of the
following: - -K, habitat destruction, illegal wildlife trade
-A Dodo was a ____ (r or k selected species) and it is extinct because of the following: - -K,
bird was easy to catch because of it's no fear to humans
-What is the difference between density dependent and density independent factors? Give
examples of each. - -Density independent factors: affect populations randomly without
respect to density, poor regulators of population, examples- hurricane, tornadoes, floods,
forest fires, drought, etc Density Dependent Factors: Affect populations when densities are
high, good regulators of a population, examples- disease, competition, predation,
parasitism
Write an equation for the rule of 70. What is it used for? - -D.T. = 70/ growth rate (r)
-What are the four factors used to determine population growth? What is the equation? - -
Births-increase size, Deaths-decrease size, immigration-increase size, emigration-decrease
size Population change= (births+immigration)- (deaths + emigration) Growth rate (r )= per
capita birth rate-per capita death rate
-From the equation in #3, what factors add organisms to a population? Which ones remove
organisms from a population? - -Organism size, energy used to make each individual,
number of offspring produced, timing of maturation, life expectancy, lifetime reproductive
events, survivorship curve
-What is population momentum? - -consequence of the demographic transition, explains
why a population will continue to grow even if the fertility rate declines
-List two characteristics of an r-selected species. - -a) spend most of their time in
Exponential growth (J shaped curve)
b) maximize the reproductive rate
-List two characteristics of a K-selected species. - -a) low death rate, live to old age
b) maintain their population levels at K
-A Whooping Crane is a __________ (r or k selected species) and it is endangered because of
the following: - -K, number of birds released has been small and they are too young for
breeding
-A California Condor is a ______ (r or k selected species) and it is endangered because of the
following: - -K, population is threatened by poison ingestion, illegal egg collection, habitat
loss, and power lines
-An Orangutan is a ____ (r or k selected species) and it is endangered because of the
following: - -K, habitat destruction, illegal wildlife trade
-A Dodo was a ____ (r or k selected species) and it is extinct because of the following: - -K,
bird was easy to catch because of it's no fear to humans
-What is the difference between density dependent and density independent factors? Give
examples of each. - -Density independent factors: affect populations randomly without
respect to density, poor regulators of population, examples- hurricane, tornadoes, floods,
forest fires, drought, etc Density Dependent Factors: Affect populations when densities are
high, good regulators of a population, examples- disease, competition, predation,
parasitism
