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Urgent --> Experiment Failed - Help in determining concentrations


ibstudent77

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Hey guys,

 

My Bio IA is testing the effect of different concentrations of copper sulfate and lead nitrate on the rate of photosynthesis in an aquatic plant. 

 

I've tried with concentrations of 0.1%, 0.3%, 0.5%, 0.7%, 0.9%.

 

However, at these concentrations, there was no photosynthesis. My teacher suggested the concentrations are too high for an aquatic plant to survive in.

My question is: What concentrations would be appropriate so there's a difference in the rate of photosynthesis, without making photosynthesis inhibitory?

 

Looking forward to your replies, really need help!

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