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Biology ISA - Preliminary Investigations

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    I'm not sure if I'm allowed to ask this but I'm really confused and I have my Biology ISA section 1 tomorrow so I would be grateful if someone replied. Basically my experiment is basically how the increase in light intensity affects the amount of oxygen produced by pond weed. Basically I thought I understood it, but I was going to just do my experiment in a classroom at room temperature - but in the preliminary investigation my teacher told me to use temperature as my control variable - I don't see how this would be possible as I would have to put the pond weed in a water bath, but how am I supposed to do that while testing the light intensity of the pond weed? I'm really confused haha so I hope someone can help

    You do the preliminary investigation before to work out a suitable range or value to use for the actual experiment. For the ISA, you would do an investigation to find out at what temperature is most suitable to use that doesn't effect the light intensity and what gets reliable results. i am also doing this ISA and we have just been doing about the preliminary experiment! Sorry if it's a bit late! xx
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Updated: October 13, 2016
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