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IB Biology SL C4.2.3 Chemical Energy Flow Questions

Light energy becomes chemical energy stored in producers. Feeding transfers this chemical energy to consumers, and respiration releases some as heat that leaves ecosystems. IB Biology SL C4.2.3 questions commonly ask you to trace these steps through a food chain or ecosystem.

Syllabus
First assessment 2025
Course
Biology SL
Level
SL

Exam points

  • Explain how producers convert light energy into chemical energy stored in compounds that can be transferred through feeding.
  • Trace chemical energy from producers to consumers as organisms feed through a food chain or food web.
  • Explain how respiration releases some chemical energy as heat, which leaves the ecosystem.

IB Biology SL C4.2.3 Chemical Energy Flow Questions 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 IB Biology SL C4.2.3 Chemical Energy Flow Questions question 1 — IB Biology SL

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

Figure for Question IB Biology SL C4.2.3 Chemical Energy Flow Questions question 1 — IB Biology SL
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