Which of the following is the best example of primary succession?
hemlock trees
A. Flood → mosses → shrubs
B. Abandoned farm → grasses
C. Exposed rock → mosses
exposed rock high order carnivores
grasses → herbivores
D. Forest fire → lichens → bushes → deer
mo organisms cause decay by breaking down dead matter into raw nutrient
The Correct Answer and Explanation is :
The best example of primary succession is:
C. Exposed rock → mosses.
Explanation:
Primary succession refers to the ecological process that occurs in an environment where no previous ecosystem existed. It begins in a lifeless area with no soil, such as newly formed volcanic rock, glacial deposits, or areas where exposed rock surfaces are uncovered after events like glacial retreats.
In these areas, there is no organic material, meaning life must begin from scratch. Pioneer species—such as lichens, mosses, and algae—are typically the first to colonize these environments. These organisms are capable of surviving in harsh conditions without soil and play a vital role in creating the initial layer of organic matter that will, over time, lead to the formation of soil.
In choice C. Exposed rock → mosses, mosses are considered one of the pioneer species, colonizing the bare rock surface. As mosses grow, they trap dust, small particles, and organic matter, slowly contributing to the formation of soil. Over time, the accumulation of organic material and the breaking down of rock by weathering processes allow for the establishment of larger plants like grasses and shrubs. This leads to a more complex community of organisms and eventually to the establishment of a climax community, such as a forest or grassland, depending on the ecosystem’s characteristics.
Other options, like A. Flood → mosses → shrubs or D. Forest fire → lichens → bushes → deer, describe secondary succession because these processes occur in areas where soil is already present and life has previously existed but was disrupted.