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CAIE A-Level Biology 18.2.4 Methods to Assess Distribution and Abundance

Practise selecting and describing frame quadrats, line or belt transects and mark–release–recapture, including Lincoln-index calculations and assumptions.

Syllabus
2028–2030
Course
Biology 9700
Level
A2

Exam points

  • choose quadrats or transects for sessile organisms and record abundance consistently
  • calculate a Lincoln estimate from first capture, second capture and marked recaptures
  • state closed-population, random-mixing and harmless-mark assumptions for recapture

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