IB ESS HL 2.2.1 Ecosystem Sustenance Question Bank
Explain how ecosystem processes sustain organisms through energy flow, matter cycling and resource replacement.
- Syllabus
- First assessment 2026
- Course
- ESS HL
- Level
- HL
Exam points
- identify the ecological process or energy relationship
- apply the correct thermodynamic, productivity or trophic concept
- justify the conclusion from evidence and system boundary
2.2.1—Ecosystem sustenance question 1
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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