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CAIE IGCSE Biology 22.3.3 Graphs Charts and Statistics Questions

Practise choosing graph types, reading biological data, describing trends over time, calculating rates and extracting values, totals and percentage changes.

Syllabus
2026–2028
Course
Biology 0610

Exam points

  • select an appropriate graph or chart type and label axes with a suitable scale
  • read exact values, ranges or intervals from a line graph, bar chart or histogram
  • calculate a gradient or rate and state the correct units
  • interpolate or extrapolate a value from a plotted trend
  • identify maxima, minima or the interval of greatest rate of change from plotted data
  • recognise a histogram mode or convert graph readings into the requested units
  • calculate a total or percentage from values represented in a graph or chart

CAIE IGCSE Biology 22.3.3 Graphs Charts and Statistics Questions question 1

[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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