Question 1

Environmental stochasticity refers to random variations in birth and death rates occurring in populations from year to year.

Accepted Answer

A) True 
 B)False

Question 2

Ecologists develop a(n)________ life table to follow the fate of a group of individuals,who were all born at a given time,from birth to death.

Accepted Answer

The answer of Ecologists develop a(n)________ life table to follow...

Question 3

The pattern shown in figure 9.6 best resembles

Accepted Answer

A) a survivorship curve. 
B) exponential growth. 
C) R0= 0. 
D) r < 0. 
A) a survivorship curve. 
B) exponential growth. 
C) R0= 0. 
D) r < 0.

Question 4

If N(0)= 30 and λ = 1.20,what is the population size for year one?

Accepted Answer

A) 25 
B) 28.8 
C) 30 
D) 36 
A) 25 
B) 28.8 
C) 30 
D) 36

Question 5

The gross reproductive rate represents the number of births per 1000 population per unit of time.

Accepted Answer

A) True 
 B)False

Question 6

When the conditions are favorable for a population at low density,such as when a species colonizes a new environment,population growth is typically

Accepted Answer

A) exponential. 
B) logistic. 
C) tangential. 
D) dynamic. 
A) exponential. 
B) logistic. 
C) tangential. 
D) dynamic.

Question 7

Which populations are at greatest risk for extinction?

Accepted Answer

A) very small ones 
B) very large ones 
C) ones with specific niches 
D) ones with extensive habitat ranges 
A) very small ones 
B) very large ones 
C) ones with specific niches 
D) ones with extensive habitat ranges

Question 8

A population that is growing has a net reproductive rate (R0)that is

Accepted Answer

A) = 0. 
B) > 0 and  1. 
A) = 0. 
B) > 0 and  1.

Question 9

qx =

Accepted Answer

A) nx/dx. 
B) nx/lx. 
C) dx/nx. 
D) Tx/nx. 
A) nx/dx. 
B) nx/lx. 
C) dx/nx. 
D) Tx/nx.

Question 10

When females form the reproductive unit of a population,what would the population be when one calculates a population of 50 from a life table?

Accepted Answer

A) 100 
B) 25 
C) 50 
D) 200 
A) 100 
B) 25 
C) 50 
D) 200

Question 11

Why is the b0 = 0 at time period x0 for some species?

Accepted Answer

A) The birthrate always starts at 0. 
B) Some species do not reproduce during the first time period. 
C) All individuals are dead at x0. 
D) This is the case because m0 times 0 always = 0. 
A) The birthrate always starts at 0. 
B) Some species do not reproduce during the first time period. 
C) All individuals are dead at x0. 
D) This is the case because m0 times 0 always = 0.

Question 12

Calculate L1,given N₁ = 100,N₂ = 50,and n₃ = 10.

Accepted Answer

A) 90 
B) 50 
C) 75 
D) 10 
A) 90 
B) 50 
C) 75 
D) 10

Question 13

A population eventually becomes ________ when its population growth (r)remains negative without reversing.

Accepted Answer

The answer of A population eventually becomes ________ when its...

Question 14

The instantaneous per capita rate of growth (r)of a growing population is greater than zero.

Accepted Answer

A) True 
 B)False

Question 15

A dynamic composite life table is different from a dynamic life table it that it uses individuals

Accepted Answer

A) born over several time periods. 
B) born in a single time period. 
C) from several different locations. 
D) from several different life tables. 
A) born over several time periods. 
B) born in a single time period. 
C) from several different locations. 
D) from several different life tables.

Question 16

The probability of survival and death usually varies with age.

Accepted Answer

A) True 
 B)False

Question 17

Life ________ refers to the average number of years that an individual is expected to live from the time of his or her birth.

Accepted Answer

The answer of Life ________ refers to the average number...

Question 18

A flood wiping out a population would be an example of

Accepted Answer

A) exponential growth. 
B) survivorship curve. 
C) demographic stochasticity. 
D) environmental stochasticity. 
A) exponential growth. 
B) survivorship curve. 
C) demographic stochasticity. 
D) environmental stochasticity.

Question 19

Survivorship curves plot ________ against x.

Accepted Answer

A) dx 
B) lx 
C) log lx 
D) qx 
A) dx 
B) lx 
C) log lx 
D) qx

Question 20

A population that is increasing in size has an intrinsic rate of population growth (r)that is

Accepted Answer

A)  0. 
D) > 1. 
A)  0. 
D) > 1.

Exam 9: Population Growth

Environmental stochasticity refers to random variations in birth and death rates occurring in populations from year to year.

Ecologists develop a(n)________ life table to follow the fate of a group of individuals,who were all born at a given time,from birth to death.

The pattern shown in figure 9.6 best resembles

If N(0)= 30 and λ = 1.20,what is the population size for year one?

The gross reproductive rate represents the number of births per 1000 population per unit of time.

When the conditions are favorable for a population at low density,such as when a species colonizes a new environment,population growth is typically

Which populations are at greatest risk for extinction?

A population that is growing has a net reproductive rate (R0)that is

qx =

When females form the reproductive unit of a population,what would the population be when one calculates a population of 50 from a life table?

Why is the b0 = 0 at time period x0 for some species?

Calculate L1,given N₁ = 100,N₂ = 50,and n₃ = 10.

A population eventually becomes ________ when its population growth (r)remains negative without reversing.

The instantaneous per capita rate of growth (r)of a growing population is greater than zero.

A dynamic composite life table is different from a dynamic life table it that it uses individuals

The probability of survival and death usually varies with age.

Life ________ refers to the average number of years that an individual is expected to live from the time of his or her birth.

A flood wiping out a population would be an example of

Survivorship curves plot ________ against x.

A population that is increasing in size has an intrinsic rate of population growth (r)that is

The Nature of Ecology

Climate

The Aquatic Environment

The Terrestrial Environment

Adaptation and Natural Selection

Plant Adaptations to the Environment

Animal Adaptations to the Environment

Properties of Populations

Life History

Intraspecific Population Regulation

Species Interactions, population Dynamics, and Natural Selection

Interspecific Competition

Predation

Parasitism and Mutualism

Community Structure

Factors Influencing the Structure of Communities

Community Dynamics

Landscape Dynamics

Ecosystem Energetics

Decomposition and Nutrient Cycling

Biogeochemical Cycles

Terrestrial Ecosystems

Aquatic Ecosystems

Coastal and Wetland Ecosystems

Large-Scale Patterns of Biological Diversity

The Ecology of Climate Change

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