IB Biology HL C4.2.3 Chemical Energy Flow Questions

Analyse light-to-chemical and chemical-to-heat conversions, trophic feeding transfers, ATP use and energy-flow losses in food webs and fish-farm evidence in IB Biology HL C4.2.3.

Exam points

Identify or analyse light-to-chemical and chemical-to-heat conversions as energy enters producers and passes through an ecosystem.
Trace chemical energy in carbon compounds from producers through feeding, consumers and decomposers, including ATP use for metabolism or biomass production.
Evaluate energy-flow evidence by linking respiration, heat, uneaten material or excretion to reduced transfer efficiency, non-recyclable energy and limited trophic-level support.

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Study C4.2.3—Chemical energy flow conceptsOpen the corresponding Concept lesson for explanations, examples and exam connections.

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

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

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IB Biology HL C4.2.3 Chemical Energy Flow Questions question 1