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A2.2.2—Microscopy skills

Microscopy combines specimen preparation, calibrated measurement, scale interpretation, and magnification calculations to reveal cellular structures while preserving accurate estimates of actual size.

Syllabus
First assessment 2025
Objective
A2.2.2
Level
HL

Exam analysis

Chance of appearing14%of analysed past papers
Latest appearanceNovember 2025
Most common paperPaper2
Typical marks1

Common command terms

  • Identify
  • Determine
  • Calculate
  • Outline
  • Deduce
  • State

Scoring notes

Common mistake
Inverting the magnification relationship between image size and actual size.

Recent exam appearances

November 2025Paper1B ["HL"] · TZ31(b)(ii)[ 1 ]A2.2.2—Microscopy skills
November 2025Paper1B ["HL"] · TZ31(b)(i)[ 1 ]A2.2.2—Microscopy skills
November 2025Paper1B ["HL"] · TZ31(a)[ 1 ]A2.2.2—Microscopy skills
May 2025Paper1B ["HL"] · TZ11(b)(ii)[ 1 ]A2.2.2—Microscopy skills
May 2025Paper1B ["HL"] · TZ11(b)(i)[ 1 ]A2.2.2—Microscopy skills
Practice this objective

Coverage 2014–2025 · Updated 15 Jul 2026

Concept essentials

  • Magnification is image size divided by actual size when both use the same unit.
  • A scale bar represents a known actual distance within an image.
  • Eyepiece graticules require calibration with a stage micrometer.
  • Specimen preparation and staining improve the visibility of cellular detail.
ConceptIB Biology HL