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IB ESS HL 2.2.28 Ecological Efficiency Question Bank

Calculate and interpret ecological efficiency between trophic levels.

Syllabus
First assessment 2026
Course
ESS HL
Level
HL

Exam points

  • identify the productivity or efficiency quantity
  • apply the appropriate calculation and units
  • interpret the ecological consequence of the result

2.2.28 (HL)—Ecological efficiency question 1

[Maximum number: 1]
Figure A sample food chain from a marine ecosystem to show the concentration of persistent organic pollutants (POPs) and the energy within each trophic level

Figure A sample food chain from a marine ecosystem to show the concentration of persistent organic pollutants (POPs) and the energy within each trophic level

Calculate, as a percentage, the efficiency of energy transfer between zooplankton and herring.

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