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IB ESS HL 2.2.1 Ecosystem Sustenance Questions

Prepare for IB ESS HL 2.2.1 by analysing how solar energy enters ecosystems, moves in one direction and dissipates while matter is exchanged and cycled.

Syllabus
First assessment 2026
Course
ESS HL
Level
HL

Exam points

  • identify solar radiation as the primary energy input to an ecosystem
  • explain energy flow and matter cycling through ecosystem stores, inputs, outputs and transformations
  • compare energy and matter transfers using conservation, heat loss, open-system exchange and biogeochemical cycling

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

IB ESS HL 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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