Syllabus Edition

First teaching 2024

First exams 2026

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Zonation, Succession & Change in Ecosystems (DP IB Environmental Systems & Societies (ESS): SL): Exam Questions

24 mins11 questions
13 marks

Define zonation in the context of ecological systems.

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21 mark

State one abiotic factor that can cause zonation.

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31 mark

Define the term succession.

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41 mark

Outline one difference between primary and secondary succession.

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51 mark

State one factor that increases as an ecosystem undergoes succession.

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14 marks

Outline how various factors influence the resilience of an ecosystem.

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22 marks

Explain how larger populations can affect ecosystem resilience.

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31 mark

The figure below shows how the dominant vegetation and crop production changes with altitude in the Andes mountain range in South America.

crops-in-andes

The changes in dominant vegetation shows a distinct pattern.

State the ecological term used to describe this pattern.

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43 marks

Outline how species diversity increases towards the later stages of succession.

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54 marks

Describe the processes involved in the formation of fertile soils from bare rock.

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63 marks

Discuss the factors contributing to the low resilience of coniferous forest monocultures.

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