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IB ESS HL 2.2.9 Consumer Energy Sources Questions

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

Syllabus
First assessment 2026
Course
ESS HL
Level
HL

Exam points

  • classify detritivores and decomposers by their consumption of dead plant, animal and faecal material
  • explain how carrion-feeding scavengers clear decay and transfer energy and nutrients through ecosystems

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

IB ESS HL 2.2.9 Consumer Energy Sources Questions question 1

[Maximum number: 1]
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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