ATAR Notes: Forum
VCE Stuff => VCE Science => VCE Mathematics/Science/Technology => VCE Subjects + Help => VCE Biology => Topic started by: angelabean on July 19, 2022, 08:40:17 pm
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What would be a controlled variable if I measured how light intensity would affect the rate of photosynthesis?
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Hi there!
When tackling these questions, I like to map out all the variables:
Independent: Light Intensity
Dependent: Rate of photosynthesis (bubbles?)
That way - anything that's not these should be controlled.
Eg:
- Temperature, Glucose concentration, number of chloroplasts (algae balls??), time, measuring equipment, carbon-dioxide concentration, etc...
Hope this helps!
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Hi,
Sorry I just realised I phrased my question wrong, in the same experiment what would be a good control group, do you need both positive and negative control groups.
I don't know if no light exposure or 0cm against a light source (closest the light can get to the beaker)?
Which one would be a better control group?