IB Biology HL C4.2.16 Secondary Production Questions

Secondary production is biomass accumulation by heterotrophs. It depends on food intake, assimilation, respiration losses and biomass conversion. IB Biology HL C4.2.16 focuses on these relationships.

Exam points

Explain secondary production as heterotroph biomass accumulation from food intake after respiration losses.
Use feed conversion ratios to compare animal feed intake with edible biomass output.

[Maximum number: 2]

The diagram shows a simplified marine food web in an area of the North Pacific Ocean.

Marine food web with arrows from kelp and algae to sea urchins; algae to mussels and clams; diatoms to fish; sea urchins, mussels and clams to sea otters; fish to harbour seals, sea lions and orcas; and sea otters, harbour seals and sea lions to orcas.

Explain reasons for the feed conversion ratio in fish being lower than in cattle.

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IB Biology HL C4.2.16 Secondary Production Questions question 1