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IB Biology HL 4.2.3 Energy flow and trophic transfer Question Bank

Practise IB Biology HL 4.2.3 by analysing energy flow through food webs and energy use by organisms.

Syllabus
First assessment 2025
Course
Biology HL
Level
HL

Exam points

  • Analyse energy conversions and carbon transfer between trophic levels.
  • Evaluate energy-flow evidence from food webs, fish farms and community interactions.

C4.2.3—Chemical energy flow question 1

[Maximum number: 3]

The mass of an individual organism can affect its physiology and feeding ecology. The diagram shows the relative mass of carbon (black) and total wet mass (grey) of a marine crustacean, Calanus hyperboreus and a jellyfish, Bathocyroe fosteri.

Figure for Question C4.2.3—Chemical energy flow question 1 — IB Biology HL
Figure for Question C4.2.3—Chemical energy flow question 1 — IB Biology HL

Explain how energy enters, flows through and is lost from marine food chains.

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