IB Biology SL 4.2.5 Supply to decomposers Question Bank
Practise IB Biology SL 4.2.5 by explaining how decomposers break down dead organic matter and recycle nutrients.
- Syllabus
- First assessment 2025
- Course
- Biology SL
- Level
- SL
Exam points
- Identify bacteria and fungi as decomposers that break down dead organic matter.
- Explain how decomposition returns nutrients to ecosystem cycles.
C4.2.5—Supply to decomposers question 1
[Maximum number: 2]
Food chains combine to form food webs in an ecosystem.
Describe the role of decomposers in ecosystems.
a. decomposers are bacteria/fungi/invertebrates;
b. break down dead organic matter / faeces;
c. release/recycle minerals/nutrients (into the environment);
For b. there MUST be a reference to the matter being dead / deceased etc. but we can accept other clear references.
Marking guidance:
Do not accept reference to recycling carbon alone as this is not a unique property of decomposers.
2
max
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