Struggling with Capture-Recapture calculations? This Edexcel GCSE Biology workbook takes students from zero confidence to exam-ready with 12 scaffolded questions using the EVERY method framework.
The EVERY method breaks each calculation into clear steps: Equation, Values, Verify units, Execute the maths, Review your answer, Yield the final answer with units. Students see a fully worked example first, then gradually do more of each step themselves until they’re solving problems independently.
What’s inside:
- 12 progressive questions on Capture-Recapture (Population = (first sample × second sample) / recaptured)
- Fully worked model answer showing the EVERY method in action
- Scaffolded questions that gradually remove support
- Self-assessment tracker for students to rate their confidence
- Full mark scheme with examiner tips
Edexcel specification reference: Topic 9 (Ecosystems and Material Cycles)
The Lincoln Index (capture-recapture) is tested in ecology topics. Students estimate population size from field data and evaluate assumptions like no immigration, emigration, births or deaths between samples.
Common student mistakes this workbook addresses: getting the formula fractions upside down, not recognising when assumptions are violated, and confusing the two sample counts.
Suitable for Edexcel GCSE Combined Science and Biology (separate award). Works for both foundation and higher tier students.
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