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IB ESS SL 2.2.9 Consumer Energy Sources Questions

Trace how consumers obtain chemical energy from producers and other organisms.

Syllabus
First assessment 2026
Course
ESS SL
Level
SL

Exam points

  • identify detritivores and decomposers as groups that feed on dead plants, animals and faeces
  • describe how scavengers remove decaying organisms and carry energy and nutrients through ecosystem pathways

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Study 2.2.9—Consumer energy sources conceptsOpen the corresponding Concept lesson for explanations, examples and exam connections.

IB ESS SL 2.2.9 Consumer Energy Sources Questions question 1

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Energy flow through an ecosystem

Figure:Energy flow through an ecosystem

the ecosystem energy-flow diagram shown above below shows the energy flow in an ecosystem. The width of the arrows is proportional to the quantity of energy transferred.

With reference to the ecosystem energy-flow diagram shown above,

State the group of organisms at C that feed on dead plants, animals and feces.

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