VALID Science 8 Practice Questions - NSW VALID Science 8 Assessment (Stage 4 Year 8 Science) Exam

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Which of the following variables must be kept constant (controlled) when investigating how light intensity affects the germination rate of radish seeds?

The distance between the light source and the seeds The number of seeds that germinate after five days The moisture level and temperature of the seed tray The intensity of the light bulb used for each group

Correct Answer:

The moisture level and temperature of the seed tray

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