Which statement regarding energy content is true?

Question

Which statement regarding energy content is true??  
A. Decomposers &gt; secondary consumers  
B. Primary consumers &gt; producers  
C. Primary consumers &gt; producers  
D. Secondary consumers &gt; primary consumers

Accepted Answer

Correct Answer: (C)Primary consumers &gt; producers. 
Rationale: Producers contain more energy than secondary consumers.In ecosystems, energy flows from one trophic level to the next, but a large portion is lost at each transfer, mainly as heat due to metabolism and normal life processes. This is commonly described by the 10% rule, which states that only about 10% of the energy at one trophic level is passed on to the next level. Because producers capture energy directly from the sun through photosynthesis, they form the base of the energy pyramid and contain the greatest total amount of energy. By the time energy reaches secondary consumers, only a small fraction of the original energy remains.A) Decomposers &gt; secondary consumersDecomposers obtain energy by breaking down dead organisms from all trophic levels, but this does not mean they contain more total energy than secondary consumers. Like all higher trophic levels, decomposers are limited by the amount of energy available in organic matter. They do not exceed secondary consumers in overall energy content. Therefore, this statement is incorrect.B) Primary consumers &gt; producersProducers, such as plants and algae, capture solar energy and convert it into chemical energy stored in glucose and other organic molecules. Primary consumers (herbivores) eat producers and receive only about 10% of that stored energy. Since most energy is lost as heat and through metabolic processes, primary consumers always contain less energy than producers. This option is incorrect.C) Producers &gt; secondary consumersProducers form the first trophic level and contain the greatest amount of energy in any ecosystem. Primary consumers receive about 10% of this energy, and secondary consumers receive about 10% of the energy stored in primary consumers, which is roughly 1% of the original energy captured by producers. This large decrease explains why food chains are short and why top consumers are few in number. This statement correctly reflects the structure of the energy pyramid.D) Secondary consumers &gt; primary consumersSecondary consumers feed on primary consumers and therefore receive even less energy than them. Because energy decreases with each trophic transfer, secondary consumers always contain less energy than primary consumers. This statement reverses the natural order of the energy pyramid and is incorrect.ConclusionEnergy decreases significantly at each trophic level in an ecosystem. Producers, which capture energy directly from sunlight, contain the most energy, while secondary consumers contain far less. Therefore, the correct answer is C) Producers &gt; secondary consumers.

Which statement regarding energy content is true?

A
Decomposers > secondary consumers

B
Primary consumers > producers

C
Primary consumers > producers

D
Secondary consumers > primary consumers

Producers contain more energy than secondary consumers.

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Which statement regarding energy content is true?

A Decomposers &gt; secondary consumers B Primary consumers &gt; producers C Primary consumers &gt; producers D Secondary consumers &gt; primary consumers

Producers contain more energy than secondary consumers.

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Related Questions

A
Decomposers > secondary consumers

B
Primary consumers > producers

C
Primary consumers > producers

D
Secondary consumers > primary consumers