Biology (B)

Lesson Review Questions

Recall

1. List the three major types of community interactions.

2. Describe the relationship between a predator population and the population of its prey.

3. What is a keystone species? Give an example.

4. Define mutualism and commensalism.

5. What is a climax community?

6. Summarize how ideas about ecological succession and climax communities have changed.

Apply Concepts

7. In 1980, a massive volcanic eruption of Mount St. Helen’s in Washington State covered a large area with lava and ash. By 2010, plants were growing in the area, including some small trees. What type of ecological succession had occurred? How do you know? Describe how living things colonized the bare rock.

Think Critically

8. Compare and contrast the evolutionary effects of intraspecific and interspecific competition.

9. Explain why most parasites do not kill their host. Why is it in their own best interest to keep their host alive?

Points to Consider

Communities consist of populations of different species. The size and growth of populations in a community are influenced by species interactions. For example, predator-prey relationships control the growth of both predator and prey populations.

• How might populations grow without these influences? What other factors do you think might affect population growth?
• What factors do you think may have affected the growth of the human population?