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CAIE IGCSE Biology 22.3 Mathematical and Data Presentation Skills Questions

Practise biological calculations, unit and scale conversions, graph interpretation and best-fit curves, using correct units, rounding and data-based comparisons.

Syllabus
2026–2028
Course
Biology 0610

Exam points

  • calculate percentages, means, ratios and absolute differences from biological data using correct denominators and stated rounding
  • derive biological rates, totals and direct-proportion results from volumes, counts, gradients or formula inputs, with correct units
  • convert metric units and use area, volume, scale or density relationships to estimate biological quantities
  • calculate a concentration or normalize a measurement per chamber volume or leaf area for valid comparison
  • select an appropriate graph or chart and label variables, units and a suitable scale on the axes
  • read exact values, ranges, modes, maxima or intervals from line graphs, charts and histograms
  • interpolate or extrapolate from plotted trends and calculate gradients or rates with correct units
  • draw a justified best-fit line or curve for a changed condition while preserving its trend and required position

Covered syllabus points

22.3.1 Numerical and algebraic calculations22.3.2 Geometry, measurement and biological scales22.3.3 Graphs, charts and statistics22.3.4 Record readings and tabulated data22.3.5 Plot, analyse and present biological data

Question 1

[Maximum number: 1]

State how the student would calculate the rates of photosynthesis from the results in Table 6.1.

Question 2

[Maximum number: 1]

Scientists measured the rate of photosynthesis in the leaves of a sunflower plant, Helianthus annuus.

The scientists used the apparatus shown in Fig. 3.1 to measure the rate of photosynthesis.

Fig. 3.1

Fig. 3.1

The scientists carried out another investigation using the same apparatus at different temperatures.

They measured the rate of uptake of carbon dioxide in the light and then they measured the rate of release of carbon dioxide in the dark.

The results are shown in Fig. 3.2.
rate of carbon dioxide uptake and release /μg/ \mu \mathrm{g} per hour per cm2\mathrm{cm}^{2} of leaf

Fig. 3.2

Fig. 3.2

Explain why the results in Table 3.1 are expressed as 'per cm2\mathrm{cm}^{2} of leaf' rather than 'per leaf'.

Question 3

[Maximum number: 2]

Fig. 4.1 is a diagram of a virus.

Fig. 4.1

Fig. 4.1

The human immunodeficiency virus (HIV) infects and destroys lymphocytes.

The number of lymphocytes in the blood of a person infected with HIV was measured over a period of 84 months.

The results are shown in Fig. 4.2.
number of lymphocytes per mm3\mathrm{mm}^{3} of blood

Fig. 4.2

Fig. 4.2

Describe the changes in the number of lymphocytes, over the 84 months following infection with HIV, shown in Fig. 4.2.

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