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CAIE IGCSE Biology 22.2.4 Interpret and Evaluate Experimental Data Questions

Practise interpreting biological results by describing patterns, spotting anomalies, checking controls and evaluating correlations with data-backed limitations.

Syllabus
2026–2028
Course
Biology 0610

Exam points

  • compare treatment effects using changes over time and a suitable data quote
  • describe a pattern including a peak or maximum with position and value
  • evaluate a conclusion by using control-group results and limitations such as sample size
  • identify an anomalous result by comparing it with the surrounding experimental pattern
  • discuss evidence for and against a correlation using data points and outliers

CAIE IGCSE Biology 22.2.4 Interpret and Evaluate Experimental Data Questions question 1

[Maximum number: 1]

Acid rain has negative effects on many ecosystems.

The second group of students placed 100 seeds in each of five Petri dishes, labelled 1 to 5. Group 2 used the same range of pH values as group 1.

They recorded the percentage of seeds that had germinated after 72 hours.
Their results are shown in Table 5.2.

Table 5.2

Table 5.2

The teacher thought that group 2 had forgotten to add the sulfuric acid to one of their Petri dishes.

Suggest which Petri dish was not set up correctly.

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