IB Biology HL C4.2.3 Chemical Energy Flow Questions

Chemical energy stored by producers passes to consumers through feeding. Energy enters most ecosystems as sunlight converted to chemical energy; it can also enter managed food webs in chemical form, such as feed on a fish farm. Respiration releases some chemical energy as heat, which leaves the ecosystem. IB Biology HL C4.2.3 questions commonly trace feeding transfers and energy conversions or losses.

Exam points

Trace chemical energy from producers to consumers through feeding in food chains and food webs.
Describe energy entering as light converted to chemical energy, or as chemical energy in food, and leaving ecosystems as heat during respiration.

[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 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