AnswersCA-Life Science B High SchoolLab: Interdependence of Organisms

Human Impact on the Environment Answers

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Which of the following could result in the extinction of a species?

A
harsh restrictions on poachers
B
increase in the habitat size of a species
C
adding a new species to the habitat
D
decrease tourism in protected areas
2
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In one species of bird, there are three varieties of feather color. What is this an example of?

A
ecosystem diversity
B
species diversity
C
genetic diversity
D
color diversity
3

Which statement best describes ecological succession?

A
It is always caused by human intervention.
B
It occurs after a disturbance.
C
It never occurs in a predictable pattern.
D
It is a series of rapid changes in an ecosystem.
4

Which bar graph best represents the provided data?Cause of extinctionPercentage of total extinctionsIntroduced species39Habitat loss36Hunting and poaching23Other 2

A
A bar graph titled Threats to Biodiversity shows cause of extinction on the horizontal axis and percent of total extinctions on the vertical axis. Introduced species, 39 percent; Hunting and poaching, 36 percent; Habitat loss, 23 percent; Other, 2 percent.
Option A
B
A bar graph titled Threats to Biodiversity shows cause of extinction on the horizontal axis and percent of total extinctions on the vertical axis. Introduced species, 40 percent; Hunting and poaching, 20 percent; Habitat loss, 40 percent; Other, 0 percent.
Option B
C
A bar graph titled Threats to Biodiversity shows cause of extinction on the horizontal axis and percent of total extinctions on the vertical axis. Introduced species, 39 percent; Hunting and poaching, 2 percent; Habitat loss, 36 percent; Other, 0 percent.
Option C
D
A bar graph titled Threats to Biodiversity shows cause of extinction on the horizontal axis and percent of total extinctions on the vertical axis. Introduced species, 39 percent; Hunting and poaching, 23 percent; Habitat loss, 36 percent; Other, 2 percent.
Option D
5

Which is one event that may lead to Primary succession?

A
clear-cutting
B
climate change
C
volcanic eruption
D
introduced species
6

According to the pie chart, which cause results in the most extinctions?

Question illustration
A
other
B
introduced species
C
habitat loss
D
hunting and poaching
7

The number of rhinoceroses has decreased to near extinction. How are rhinoceroses classified under the Endangered Species Act?

A
endangered
B
threatened
C
extinct
D
pioneer
8

Which statement best describes ecological succession?

A
It is always caused by human intervention.
B
It occurs after a disturbance.
C
It never occurs in a predictable pattern.
D
It is a series of rapid changes in an ecosystem.
9

Which factors involving the activities of people are a threat to biodiversity?

A
pollution and succession
B
habitat loss and predation
C
poaching and habitat loss
D
succession and poaching
10

Rhinoceroses are being poached at a rate of two or three a week in Africa and Asia. Which type of diversity is being lost as the population of rhinoceroses becomes very small?

A
species diversity
B
genetic diversity
C
ecosystem diversity
D
fragmented diversity
11

Which factors involving the activities of people are a threat to biodiversity?

A
pollution and succession
B
habitat loss and predation
C
poaching and habitat loss
D
succession and poaching
12

Which disturbance would result in primary succession?

A
harvesting wheat by using a combine harvester at the end of the growing season
B
controlled burning to stimulate the growth of forest trees such as sequoia
C
the formation of Surtsey, a volcanic island off of the southern coast of Iceland
D
the effect of a large herd of elephants on the grasses and shrubs in an area
13

The diagram below shows the stages of succession in a forest ecosystem. Which area shows the climax community of secondary succession?

Question illustration
A
A
B
B
C
C
D
D
14

How does a whale fall community affect ocean sediment?

A
The decomposition of the whale enriches the sediment.
B
The remains of the whale pollute the sediment.
C
The sediment is transformed into food for mussels and crabs.
D
The bacteria that are attracted break down the sediment nearby.
15

The number of rhinoceroses has decreased to near extinction. How are rhinoceroses classified under the Endangered Species Act?

A
endangered
B
threatened
C
extinct
D
pioneer
16

On May 18, 1980, Mount St. Helens in Washington State experienced a huge volcanic eruption after a magnitude 5.1 earthquake. During the eruption, hot ash and pumice poured down the west, south, and east sides of the mountain, melting the snow and ice at the top of the volcano and producing volcanic mudflows. Which type of process first occurred in the ecosystem around Mount St. Helens after it erupted?

A
primary succession
B
secondary succession
C
a climax community
D
species extinction
17

Which factor can cause secondary succession?

A
clear cutting
B
glacial melting
C
competition
D
predation
18

Which bar graph best represents the provided data?Cause of extinctionPercentage of total extinctionsIntroduced species39Habitat loss36Hunting and poaching23Other 2

A
A bar graph titled Threats to Biodiversity shows cause of extinction on the horizontal axis and percent of total extinctions on the vertical axis. Introduced species, 39 percent; Hunting and poaching, 36 percent; Habitat loss, 23 percent; Other, 2 percent.
Option A
B
A bar graph titled Threats to Biodiversity shows cause of extinction on the horizontal axis and percent of total extinctions on the vertical axis. Introduced species, 40 percent; Hunting and poaching, 20 percent; Habitat loss, 40 percent; Other, 0 percent.
Option B
C
A bar graph titled Threats to Biodiversity shows cause of extinction on the horizontal axis and percent of total extinctions on the vertical axis. Introduced species, 39 percent; Hunting and poaching, 2 percent; Habitat loss, 36 percent; Other, 0 percent.
Option C
D
A bar graph titled Threats to Biodiversity shows cause of extinction on the horizontal axis and percent of total extinctions on the vertical axis. Introduced species, 39 percent; Hunting and poaching, 23 percent; Habitat loss, 36 percent; Other, 2 percent.
Option D
19

The diagram below shows the stages of succession in a forest ecosystem. Which area shows the climax community of secondary succession?

Question illustration
A
A
B
B
C
C
D
D

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