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December 01, 2022, 01:28:15 pm

Author Topic: Photosynthesis  (Read 1448 times)  Share 

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angelabean

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Photosynthesis
« 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?

RaspberryTau

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Re: Photosynthesis
« Reply #1 on: July 21, 2022, 03:31:10 pm »
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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!
VCE 2021: Methods (42 raw), Biology (46 raw); 2022: Chemistry, English, Spec, Physics

angelabean

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Re: Photosynthesis
« Reply #2 on: July 22, 2022, 10:12:54 am »
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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?