In this video you will learn all the science for this topic to get a grade 9 or A* in your science exams!
We are investigating the effect of light intensity on the volume of oxygen produced by pondweed.
The variable we change is the independent variable. We change the light intensity.
If the distance of the plant from the light source increases - light intensity decreases.
If the distance of the plant from the light source decreases - light intensity increases.
The variable we measure is the dependent variable. We are measuring the volume of oxygen collected in the syringe.
The variables we keep the same are the control variables.
These control variables include time, pH, pondweed size, temperature.
This is so our results are reliable.
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