IB Biology HL C4.1.2 Population Size Estimation Questions

Compare quadrats, transects, capture-mark-release-recapture, sonar and catch records while judging sampling bias and population-estimate assumptions in IB Biology HL C4.1.2.

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Select and describe random, stratified or systematic sampling with quadrats or transects, matching the method to habitat structure and reducing sampling bias.
Compare population-estimation methods for sessile and mobile organisms, including quadrats/transects, capture-mark-release-recapture, sonar or catch records, and state their assumptions or limitations.
Evaluate population estimates by considering incomplete coverage, uneven distribution, age structure, migration and the representativeness of the sampled population.

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Study C4.1.2—Population size estimation conceptsOpen the corresponding Concept lesson for explanations, examples and exam connections.

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The Atlantic cod is considered in many countries to be endangered due to overfishing. Describe two methods that could be used to estimate the cod population.

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IB Biology HL C4.1.2 Population Size Estimation Questions question 1