Answers25.26 TCEC BIO 1Populations and the Environment

Population Size and Structure Answers

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

Which two factors can both cause a population to increase?

A
birth rate and emigration
B
birth rate and emigration
C
birth rate and immigration
D
birth rate and immigration
E
death rate and immigration
F
death rate and immigration
G
death rate and emigration
H
death rate and emigration
4

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
7

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

A
death rate
B
death rate
C
immigration
D
immigration
E
emigration
F
emigration
G
births
H
births
10

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
11

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
12

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
13

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
14

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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