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Unit 3 Populations APES Exam Review
Questions and Correct Answers/ Latest
Update / Already Graded
Write an equation for the rule of 70. What is it used for?
Ans: D.T. = 70/ growth rate (r)
What are the four factors used to determine population growth? What
is the equation?
Ans: 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?
Ans: 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?
All rights reserved © 2025/ 2026 |
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Ans: 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.
Ans: 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.
Ans: 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:
Ans: 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:
Ans: K, population is threatened by poison ingestion, illegal
egg collection, habitat loss, and power lines
All rights reserved © 2025/ 2026 |
Unit 3 Populations APES Exam Review
Questions and Correct Answers/ Latest
Update / Already Graded
Write an equation for the rule of 70. What is it used for?
Ans: D.T. = 70/ growth rate (r)
What are the four factors used to determine population growth? What
is the equation?
Ans: 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?
Ans: 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?
All rights reserved © 2025/ 2026 |
, Page |2
Ans: 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.
Ans: 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.
Ans: 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:
Ans: 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:
Ans: K, population is threatened by poison ingestion, illegal
egg collection, habitat loss, and power lines
All rights reserved © 2025/ 2026 |
