Population Growth Answers

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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
2
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Which human activity can produce disruption of fish breeding habits, increase in mosquito population, and flood control?

A
construction of dams to produce electricity
B
habitat destruction that decreases beaver population
C
increased erosion due to improper farming techniques
D
overfishing in artificial lakes
3

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

A
immigration
B
emigration
C
birth rate
D
population
4

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
5

The great hornbill and the toucan both eat the same fruit, insects, and nuts. They both live in the rainforest. Their large bills function to get food and also as warning coloration. Which of the following is a limiting factor to the toucan population?

A
overlapping breeding seasons
B
bill coloration
C
genetic variability
D
competition
6

A population of elephants becomes too large, and several members leave the population. What is this process called?

A
death rate
B
immigration
C
emigration
D
births
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

Poison dart frogs live in the rainforest. They produce a poison by eating toxic fire ants. The only known predator is a snake, Liophis epinephelus. Which is most likely a density-independent factor that affects the poison dart population in the rainforest?

A
clear cutting the rainforest
B
limited food source
C
susceptibility to disease
D
increase in population of Liophis epinephelus
9

Predict what might happen to a population that is experiencing little immigration and emigration, low birth rate, and high death rate.

A
The population decreases.
B
The population increases.
C
The population grows too much too fast.
D
The population grows outside of its habitat.
10

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
11

In August 2005, Hurricane Katrina caused significant damage in several states along the Gulf Coast, including Alabama, Mississippi, and Louisiana. Thousands of people were evacuated from their homes due to flooding and other damage that was caused by the storm. Which type of limiting factor was Hurricane Katrina?

A
density-independent factor
B
density-dependent factor
C
population-dependent factor
D
population-independent factor
12

The construction of wind farms has affected the migratory patterns of some bird populations. Bird populations have been noted to no longer increase and sometimes even decrease in these areas. What is this known as?

A
a density-dependent limiting factor
B
a population-independent factor
C
a density-independent limiting factor
D
a population-dependent limiting factor
13

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
14

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
15

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
16

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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