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IB Biology SL 4.2.22 Decomposers and nutrient cycling Question Bank

Practise IB Biology SL 4.2.22 by explaining how decomposers recycle matter in ecosystems.

Syllabus
First assessment 2025
Course
Biology SL
Level
SL

Exam points

  • Explain how detritivores and decomposers obtain nutrition.
  • Describe how carbon and nutrients are recycled through decomposition.

C4.2.22—Recycling of all chemical elements question 1

[Maximum number: 2]

The bar chart shows the mass of animal feed required to produce one kilogram of meat, egg or milk (kg dry matter in feed per kg of output).

Figure for Question C4.2.22—Recycling of all chemical elements question 1 — IB Biology SL

Feed conversion ratio / kg dry matter in feed per kg of output

Outline two ways in which agricultural production of animals may change the cycling of nutrients (for example phosphorous or nitrogen) in ecological systems.

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