Population Size and Structure Answers

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Raccoons prefer woody areas and are omnivores, which means that they eat meat and plant materials. They are nocturnal, meaning that they are active at night. They are often eaten by mountain lions, gray wolves, and coyotes. Which of the following is a limiting factor for a raccoon population?

A
shortened summer days
B
deforestation
C
claw length
D
breeding season
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In one year, 35 giraffes are born to a population. What does this number represent?

A
growth rate
B
emigration
C
immigration
D
birth rate
3

Which two factors can both cause a population to increase?

A
birth rate and emigration
B
birth rate and immigration
C
death rate and immigration
D
death rate and emigration
4

Which type of limiting factor affects a large population more than it affects a small population?

A
density dependent
B
density independent
C
population dependent
D
population independent
5

A square kilometer of forest has 200 deer. What is the term that is used to describe this number?

A
density-dependent
B
birth rate
C
limiting factors
D
population density
6

What will most likely increase if there is a high death rate?

A
immigration
B
emigration
C
birth rate
D
population
7

A population of cheetahs has a birth rate of 5 and a death rate of 15. Immigration is 2, and emigration is 4. What is its population growth?

A
–14
B
–12
C
12
D
14
8

Which best describes the following impacts: water storage, clean energy, and flood prevention?

A
positive impact of a density-dependent limiting factor
B
positive impact of a hurricane
C
positive impact of beavers in an ecosystem
D
positive impacts of dams on society
9

Colorado has a vast population of lodgepole pines. A population of lodgepole pines has been killed in a section of the forest. What is a possible limiting factor of that population?

A
devastation by the pine bark beetle
B
Colorado’s long history of acidic soils
C
genetic variability
D
shallow root system
10

Typhoid fever is caused by bacteria in contaminated food or drink. In 1903, an outbreak of typhoid fever in Ithaca, New York, killed almost 80 people. In addition, more than 1,000 Ithaca residents became sick with the disease. The population shares the public water source. Which type of limiting factor was involved in the typhoid outbreak that occurred in Ithaca?

A
density-independent factor
B
density-dependent factor
C
population-dependent factor
D
population-independent factor

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