2A: Ecological Succession

Multiple Choice

Which of the following best describes primary succession?

• Formation of a brand new ecosystem

• Recovery of an old ecosystem

• Replacement of one species by another in a stable ecosystem

• Sudden destruction of an ecosystem

Multiple Choice

Which of the following is an example of an area where primary succession can occur?

• A forest after a wildfire

• A field left fallow for several years

• Exposed rock after a volcanic eruption

• A pond that has dried up

Multiple Choice

What is the role of pioneer species in primary succession?

• They are the last organisms to arrive and stabilize the environment.

• They are the first organisms to colonize a barren environment and help create soil.

• They compete with established plants for resources.

• They prevent other species from growing.

Multiple Choice

Which of the following changes occur as primary succession progresses from bare rock to a mature forest?

• Decrease in soil depth and nutrients

• Increase in plant diversity and soil formation

• Decrease in the number of animal species

• Immediate appearance of large trees

Multiple Select

Which of the following are considered pioneer species in secondary succession?

• Weeds

• Lichens

• Coral