Which term would describe the first organisms to colonize a barren landscape?

Which term would describe the first organisms to colonize a barren landscape?

• A. Pioneer species
• B. Secondary succession
• C. Emigration
• D. Symbiosis

Answer: (A)

When a barren landscape starts from scratch, the first organisms to establish are pioneer species. This is about primary succession, where life begins in an area with little or no soil. Pioneer species are hardy and tolerate harsh conditions—they can survive on bare rock or exposed ground. Lichens and mosses are classic examples. TheyBreak down rock physically and chemically and begin to build the soil by contributing organic matter from their tissues as they live and die. As this initial soil forms and nutrients accumulate, it becomes possible for more complex plants to take root, setting the stage for gradual ecological development and the arrival of other species. The other terms don’t describe this initial colonization: emigration is leaving an area, symbiosis is just a type of relationship between species, and secondary succession refers to recovery after a disturbance when soil is already present.

When a barren landscape starts from scratch, the first organisms to establish are pioneer species. This is about primary succession, where life begins in an area with little or no soil. Pioneer species are hardy and tolerate harsh conditions—they can survive on bare rock or exposed ground. Lichens and mosses are classic examples. TheyBreak down rock physically and chemically and begin to build the soil by contributing organic matter from their tissues as they live and die. As this initial soil forms and nutrients accumulate, it becomes possible for more complex plants to take root, setting the stage for gradual ecological development and the arrival of other species. The other terms don’t describe this initial colonization: emigration is leaving an area, symbiosis is just a type of relationship between species, and secondary succession refers to recovery after a disturbance when soil is already present.