Lesson 8: Human Impact on the Environment

Question 1

Which factor can cause secondary succession?

Revolt · Accepted Answer

clear cutting

Question 2

Why are lichens a good pioneer species after a volcanic eruption?

Revolt · Accepted Answer

They are able to grow on bare rock.

Question 3

Which statement best describes ecological succession?

Revolt · Accepted Answer

It occurs after a disturbance.

Question 4

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

Revolt · Accepted Answer

endangered

Question 5

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

Revolt · Accepted Answer

poaching and habitat loss

Question 6

What is most likely to result immediately after a rainforest in Brazil is clear-cut?

Revolt · Accepted Answer

secondary succession

Question 7

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

Revolt · Accepted Answer

D

Question 8

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

Revolt · Accepted Answer

introduced species

Question 9

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

Revolt · Accepted Answer

genetic diversity

Question 10

Which disturbance would result in primary succession?

Revolt · Accepted Answer

the formation of Surtsey, a volcanic island off of the southern coast of Iceland

Lesson 8: Human Impact on the Environment Answers