Unit 3: Changing Ecosystems.1

What is ecological succession?

• The random appearance of new species in a community

• The process of one community replacing another over time

• The immediate change in a community due to a natural disaster

• The static state of a community over time

Which of the following is a pioneer species?

• Oak trees

• Shrubs

• Pine trees

• Lichens

What is primary succession?

• The development of plant communities on previously vegetated land

• The development of plant communities on bare ground

• The replacement of one community by another due to human activities

• The sudden appearance of new species in an existing community

What is secondary succession?

• The development of plant communities on bare ground

• The development of plant communities where a previous community has been removed

• The final stage of ecological succession

• The initial colonization of an area by pioneer species

Which of the following is NOT a feature of pioneer species?

• Slow germination of seeds

• Tolerance to extreme conditions

• Ability to photosynthesize

• Ability to fix nitrogen

What is a climax community?

• The first stage of ecological succession

• An intermediate stage in ecological succession

• The final, stable community in ecological succession

• A community that is constantly changing

What is a sere?

• An intermediate stage in ecological succession

• A type of climax community

• A type of secondary succession

• A pioneer species

Tags

NGSS.MS-LS2-4

What is the role of lichens in primary succession?

• They prevent other species from growing

• They break down rock to form soil

• They are the final stage of succession

• They are the first animal species to colonize an area

Tags

NGSS.MS-LS2-2

What is a disclimax community?

• A community in the early stages of succession

• A community that is unaffected by human activities

• A community that has reached its climax

• A community that has been degraded by the activities of organisms

Which of the following is an example of primary succession?

• Forest regrowth after a fire

• Lichens growing on bare rock

• Grass growing in a field

• Shrubs growing in a garden