BI-964
Planning an investigation
Biology · Secondary 3 · Medium · Planning an investigation
A student sets up an experiment with an aquatic plant to measure the effect of light intensity on the volume of oxygen produced in 10 minutes. The distance of the lamp from the plant is changed each time. Which two factors must be kept constant in every repeat to make the test fair?
- The size of aquatic plant and the time exposed to the light.
- The size of aquatic plant and the volume of water in the beaker.
- The distance of the lamp and the height of the measuring cylinder.
- The volume of water in the beaker and the time exposed to the light.
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