Multiple Choice
Which of the following is an example of a pioneer species in ecological succession?
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48. Ecology
Introduction to Ecology
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In an ecosystem, how do the roles of detritivores differ from those of decomposers?
A
Detritivores produce energy through photosynthesis, while decomposers consume living plants.
B
Detritivores consume dead organic matter, while decomposers break it down chemically.
C
Detritivores are primary producers, while decomposers are secondary consumers.
D
Detritivores are responsible for nitrogen fixation, while decomposers are responsible for carbon fixation.
Verified step by step guidance1
Begin by understanding the roles of detritivores and decomposers in an ecosystem. Detritivores are organisms that consume dead organic matter, such as dead plants and animals, and break it down into smaller particles. Decomposers, on the other hand, are organisms like bacteria and fungi that chemically break down dead organic matter, recycling nutrients back into the ecosystem.
Clarify the misconception that detritivores produce energy through photosynthesis. Detritivores do not perform photosynthesis; they obtain energy by consuming dead organic matter. Photosynthesis is a process carried out by primary producers like plants and algae.
Examine the statement that detritivores are primary producers. This is incorrect because primary producers are organisms that produce energy through photosynthesis, such as plants and algae. Detritivores are consumers, not producers.
Understand the difference between nitrogen fixation and carbon fixation. Nitrogen fixation is a process carried out by certain bacteria and archaea that convert atmospheric nitrogen into a form usable by plants. Carbon fixation is part of photosynthesis, where carbon dioxide is converted into organic compounds by plants. Detritivores and decomposers are not directly responsible for these processes.
Conclude by summarizing the correct roles: Detritivores consume dead organic matter, breaking it down into smaller particles, while decomposers chemically break down dead organic matter, recycling nutrients back into the ecosystem.
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