AnswersBiologySuccession and Extinction

Succession and Extinction — Quiz Answers

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1
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Which area shows the climax community of secondary succession?

A
A
B
B
C
C
D
D
2
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According to the pie chart, which cause results in the most extinctions?

A
habitat loss
B
other
C
introduced species
D
hunting and poaching
3

In one species of bird, there are three varieties of feather color. What is this an example of?

A
genetic diversity
B
color diversity
C
ecosystem diversity
D
species diversity
4

How could the loss of biodiversity affect humans?

A
It could cause a decrease in the amount of pollutants on the planet.
B
It could lead to a decrease in infectious and other diseases that affect humans.
C
It may cause an increase in the human population as competition is reduced.
D
It may lead to the loss of potential medicines, foods, and products.
5

Which bar graph best represents the provided data? Cause of extinction Percentage of total extinctions Introduced species 39 Habitat loss 36 Hunting and poaching 23 Other 2

A
Image with description A bar graph titled “Threats to Biodiversity” with percent of total extinctions on the vertical axis and causes on the horizontal axis. The bars show introduced species about 39 percent, habitat loss about 36 percent, hunting and poaching about 23 percent, and other about 2 percent.
B
Image with description A bar graph titled “Threats to Biodiversity” with percent of total extinctions on the vertical axis and causes on the horizontal axis. The bars show introduced species about 39 percent, habitat loss about 36 percent, and a combined category of hunting, poaching, and other at about 25 percent.
C
Image with description A bar graph titled “Threats to Biodiversity” with percent of total extinctions on the vertical axis and causes on the horizontal axis. The bars show introduced species about 39 percent, hunting and poaching about 36 percent, habitat loss about 23 percent, and other about 2 percent.
D
Image with description A bar graph titled “Threats to Biodiversity” with percent of total extinctions on the vertical axis and causes on the horizontal axis. The bars show introduced species about 40 percent, habitat loss about 40 percent, and hunting and poaching about 20 percent, with no separate bar for other.
6

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
genetic diversity
B
fragmented diversity
C
species diversity
D
ecosystem diversity
7

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

A
harsh restrictions on poachers
B
increase in the habitat size of a species
C
decrease tourism in protected areas
D
adding a new species to the habitat
8

Which statement best describes ecological succession?

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

On May 18, 1980, Mount St. Helens in Washington State experienced a huge volcanic eruption after a magnitude 5 point 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
secondary succession
B
species extinction
C
primary succession
D
a climax community
10

Which is one event that may lead to Primary succession?

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

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