Multiple Choice
What is the role of decomposers in the food chain?
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48. Ecology
Introduction to Ecology
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Which of the following situations typically leads to the start of secondary succession in an ecosystem?
A
The formation of a new island
B
Glacial retreat exposing bare rock
C
A forest fire clearing existing vegetation
D
A volcanic eruption creating new land
Verified step by step guidance1
Understand the concept of secondary succession: Secondary succession occurs in areas where a disturbance has removed the existing vegetation but left the soil intact. This is different from primary succession, which starts on bare rock or newly formed land without soil.
Identify the key characteristics of secondary succession: It typically follows events that clear out existing life forms but do not destroy the soil, such as forest fires, hurricanes, or human activities like farming.
Analyze the given situations: Consider which of these scenarios involve the removal of vegetation while leaving the soil layer intact.
Evaluate the options: The formation of a new island and a volcanic eruption creating new land both involve starting from bare rock or new land, which is characteristic of primary succession. Glacial retreat also exposes bare rock, leading to primary succession.
Conclude with the correct scenario: A forest fire clearing existing vegetation fits the criteria for secondary succession, as it removes plants but leaves the soil ready for new growth.
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