IB Biology SL · 2025

4.11 Stability and change

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SL archive · from 2025

4.11 Stability and change

Latest exam session: November 2025

questions
2
questions
papers
1
papers
exam session
1
exam session
micro-topics
2

Micro-topics in 4.11 Stability and change

In syllabus order. The ring is the share of papers each appears in.

  • 8

    4.11.2

    Disruption, eutrophication and tipping points

    1 question · in 8% of papersAppears in 1 of the 12 Biology SL papers analysed (8%), at least once each.

    Occasional

    last Nov 25 P1 TZ3

  • 8

    4.11.4

    Phenotypic plasticity

    1 question · in 8% of papersAppears in 1 of the 12 Biology SL papers analysed (8%), at least once each.

    Occasional

    last Nov 25 P1 TZ3

Exam pattern

How often each micro-topic has been examined, year by year. Each label is explained under the grid.

Does it repeat?

Questions per year for each micro-topic.

fewermore

Micro-topic2025
4.11.4Phenotypic plasticityOccasional
1Phenotypic plasticity, 2025: 1 question
4.11.2Disruption, eutrophication and tipping pointsOccasional
1Disruption, eutrophication and tipping points, 2025: 1 question
  • Occasionalin about one paper in ten

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Questions on 4.11 Stability and change, by exam session

Which papers asked about 4.11 Stability and change, and which question numbers. Open a paper to see them highlighted.

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Frequently asked questions

Short answers about this page.

Which Biology SL exam sessions are covered for 4.11 Stability and change?

3 exam sessions from 2025, the latest November 2025. Every Paper 1 in every timezone is read and classified in full, which gives 1 paper in this archive.

Which 4.11 Stability and change topic comes up most?

Phenotypic plasticity (4.11.4): in 8% of papers, last seen Nov 25 P1 TZ3. Usually "other", worth about 1 marks in a paper that includes it.

Can I see the original question and mark scheme?

No. The wording belongs to the IB. You get the citation, the marks, the command term and the skill tested, plus our own matched practice questions with worked answers and AI marking.

What do "banker", "due" and "rising" mean?

Banker: examined in at least one sitting in four and still appearing. Due: regular before, but absent for the last two exam sessions. Rising: clearly more common in the last two years. Our classification of real papers, not an IB statistic.

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