CAIE IGCSE Biology 22.2.2 Plan Experiments and Investigations Questions

Practise planning fair biological investigations by selecting variables, controls and apparatus settings that isolate causes and produce valid comparisons.

Exam points

select an independent variable and keep other environmental conditions controlled for a fair comparison
use a control, placebo or untreated comparison to isolate the effect of the tested treatment
remove a confounding substance or include a control tube to isolate the mechanism being tested
identify environmental variables such as temperature, light, pH and oxygen supply that could affect growth
standardize sample dimensions or surface area so results are comparable

[Maximum number: 1]

State why the student:

kept the lamp at the same distance during the investigation,

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CAIE IGCSE Biology 22.2.2 Plan Experiments and Investigations Questions question 1