For a test, I had to carry out an experiment in which I placed pondweed in boiling tubes and wrapped each boiling tube in a coloured filter to see if changing the wavelength of light changed the rate of photosynthesis. we then counted the number of oxygen bubbles produced for the rate.
what would be an area of uncertainty in this investigation and could you explain it please? also, how would you know if your results were reproducible?
many thanks.