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[HELP] How to answer GCSE Biology controlled assesment ISA, question 4?? Watch

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    Hello, please can someone help me out with a question on my GCSE ISA that I have no idea how to answer. It's a GCSE Biology ISA controlled assessment, and the experiment is investigating the rate of photosynthesis with the wavelength of light (color of light filter). On question 4, it asks you what other way there is to investigate the hypothesis (The rate of photosynthesis will be lowest when the light wavelength is green/50nm). How else could you investigate this, other than shining a light with a red/blue color filter on it? Thanks
 
 
 
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