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IB ESS SL 2.2.1 Ecosystem Sustenance Questions

Prepare for IB ESS SL 2.2.1 by tracing sunlight as energy input and comparing how energy flows while matter cycles through open ecosystems.

Syllabus
First assessment 2026
Course
ESS SL
Level
SL

Exam points

  • identify sunlight or solar radiation as the main energy input sustaining a photosynthetic ecosystem
  • compare energy and matter movement through inputs, outputs, transformations, cycling and conservation in ecosystems

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Study 2.2.1—Ecosystem sustenance conceptsOpen the corresponding Concept lesson for explanations, examples and exam connections.

IB ESS SL 2.2.1 Ecosystem Sustenance Questions question 1

[Maximum number: 1]
Figure: Example of a lake ecosystem

Figure:Example of a lake ecosystem

Figure: Example of a lake ecosystem below shows an example of a lake ecosystem.

Rooting flowering plants: producers

State the source of energy for this ecosystem.
(a) (i) State the source of energy for this ecosystem.

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