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IB Biology HL 4.1.4 Capture-mark-release-recapture Question Bank

Practise IB Biology HL 4.1.4 by relating marking, mixing, sample size and recapture assumptions to reliable Lincoln-index population estimates.

Syllabus
First assessment 2025
Course
Biology HL
Level
HL

Exam points

  • Relate marking, mixing, sample size and recapture assumptions to reliable Lincoln-index population estimates.
  • Interpret capture–recapture data and limitations across fish, snails, mice and mobile animal populations.

C4.1.4—Capture-mark-release-recapture question 1

[Maximum number: 3]

The diagram shows levels of DDT, a pesticide, in an aquatic food web in Lake Kariba, Africa. Numbers represent ppm (parts per million) of DDT in fat tissue.

Figure for Question C4.1.4—Capture-mark-release-recapture question 1 — IB Biology HL

Outline how the population size of tilapia could be estimated.

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