Multiple Choice
A study of metabolic rates in a terrestrial community showed that the energy released by respiration exceeded the energy captured in photosynthesis. Which of the following situations is most likely?
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52. Ecosystems
Introduction to Ecosystems
Multiple Choice
In the transition from each trophic level of the food chain to the next trophic level, there is about a __________.
A
90% gain of energy
B
2% gain of energy
C
2% loss of energy
D
5% loss of energy
E
90% loss of energy
Verified step by step guidance1
Understand the concept of energy transfer in a food chain: In an ecosystem, energy flows from one trophic level to the next, starting from producers (like plants) to various levels of consumers (herbivores, carnivores, etc.).
Recognize the inefficiency of energy transfer: Not all energy is transferred from one trophic level to the next. A significant portion of energy is lost at each step, primarily as heat due to metabolic processes.
Recall the 10% rule: A general rule of thumb in ecology is that only about 10% of the energy from one trophic level is transferred to the next level. This means that approximately 90% of the energy is lost.
Apply the 10% rule to the given options: Since only about 10% of energy is transferred, the remaining 90% is lost. This aligns with the option stating a 90% loss of energy.
Conclude with the correct understanding: The transition from each trophic level to the next involves a 90% loss of energy, which is a fundamental concept in understanding energy flow in ecosystems.
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