Which of the following is an example of primary succession?

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Question: Which of the following is an example of primary succession?

Option 1: plant communities are established in a lifeless environment, usually devoid of soil.
This is the classic definition of primary succession. It describes colonization of new substrates where no soil or life previously exists, such as bare rock or newly formed land, followed by initial soil formation and establishment of pioneering organisms.

Option 2: a plant community becoming simplified with fewer species and less biomass.
This describes a decline in diversity and biomass, which is more characteristic of a disturbance event leading to secondary succession or degradation, not the initial colonization of a lifeless area. It implies prior soil and existing community, which contradicts primary succession.

Option 3: an ecosystem diversifying, supporting more species and increases in biomass.
While succession overall involves increasing diversity and biomass over time, this statement is too general and could apply to many stages, including secondary succession. It does not specify the absence of soil or prior organisms needed to illustrate primary succession.

Option 4: a succession of larger plants (trees, shrubs, etc.) following the establishment of pioneer species.
This describes later stages of succession where pioneer species pave the way for larger plants. It reflects secondary or later stages rather than the very beginning characteristic of primary succession.

In summary, Option 1 uniquely captures the essence of primary succession by describing establishment in a lifeless substrate with little to no soil, which sets the stage for subsequent soil formation and biotic colonization.

BIOL 1009 (001-006/050-055) Final Exam

Which of the following is an example of primary succession?

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