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C4.1.11—Interspecific relationships

Interspecific relationships explains how ecological evidence links organisms, resources and interactions to population size, distribution or community structure in a habitat.

Syllabus
First assessment 2025
Objective
C4.1.11
Level
HL

Exam analysis

Chance of appearing10%of analysed past papers
Latest appearanceMay 2025
Most common paperPaper3
Typical marks1–2

Common command terms

  • Identify
  • Discuss
  • Describe
  • State
  • Suggest
  • Predict
  • Deduce
  • Evaluate

Scoring notes

Common mistake
Confusing a population with a community or with all organisms in an ecosystem.

Recent exam appearances

May 2025Paper2 ["HL"] · TZ35(b)[ 2 ]C4.1.11—Interspecific relationships
November 2024Paper3 ["HL"] · TZ016(b)[ 3 ]C4.1.11—Interspecific relationships
May 2024Paper2 ["HL"] · TZ11(j)[ 1 ]C4.1.11—Interspecific relationships
May 2024Paper2 ["HL"] · TZ11(i)[ 1 ]C4.1.11—Interspecific relationships
May 2024Paper2 ["HL"] · TZ11(c)[ 1 ]C4.1.11—Interspecific relationships
Practice this objective

Coverage 2012–2025 · Updated 16 Jul 2026

Concept essentials

  • Interspecific relationships must be linked to the correct ecological unit, method or species interaction.
  • The evidence for interspecific relationships depends on measurable abundance, distribution, survival or resource patterns.
  • Interspecific relationships is clearest when cause, ecological process and population outcome are kept distinct.
  • Field or graph evidence for interspecific relationships needs biological interpretation, not values alone.
ConceptIB Biology HL