CAIE IGCSE Biology 22.2.2 Planning Experiments and Investigations

Practise choosing environmental variables that could affect seedling growth and explaining how fixed apparatus settings keep light intensity controlled.

Exam points

choose environmental control variables such as temperature, light, pH and oxygen supply
explain that a fixed lamp distance controls light intensity, not temperature or fairness alone

[Maximum number: 1]

State why the student:

kept the lamp at the same distance during the investigation,

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22.2.2 Plan experiments and investigations question 1