Exploring the Carbon Cycle and Succession

Which of the following best describes the role of pioneer species in primary succession?

• They are the final, stable community in an ecosystem.

• They are the first organisms to colonise a barren environment.

• They are responsible for decomposing organic matter.

• They are large trees that provide shade for other species.

During the carbon cycle, which process removes carbon dioxide from the atmosphere?

• Respiration

• Combustion

• Photosynthesis

• Decomposition

What is the main difference between primary and secondary succession?

• Primary succession occurs in areas with existing soil, while secondary succession does not.

• Primary succession starts on bare rock or sand, while secondary succession occurs where soil is already present.

• Secondary succession involves pioneer species, while primary succession does not.

• Primary succession is faster than secondary succession.

Which of the following is an example of a pioneer species?

• Oak tree

• Lichen

• Earthworm

• Fox

In the carbon cycle, which process returns carbon to the atmosphere after the death of living organisms?

• Photosynthesis

• Decomposition

• Transpiration

• Nitrogen fixation

What is the term for the stable, mature community that develops at the end of succession?

• Pioneer community

• Climax community

• Transitional community

• Secondary community

Which of the following equations best represents the process of photosynthesis in the carbon cycle?

Which of the following is NOT a way that carbon is released into the atmosphere?

• Respiration

• Photosynthesis

• Combustion of fossil fuels

• Decomposition

Why are pioneer species important for the development of a climax community?

• They prevent other species from colonising the area.

• They modify the environment, making it suitable for other species.

• They are the only species that can survive in mature ecosystems.

• They increase the temperature of the environment.

Which of the following best describes the sequence of communities during primary succession?

• Climax community → Pioneer community → Transitional community

• Pioneer community → Transitional community → Climax community

• Transitional community → Climax community → Pioneer community

• Pioneer community → Climax community → Transitional community