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#Use a timer to count the number of bubbles produced by the pond weed.
#Repeat steps three and four 6 times increasing the distance by 10cm each time.
===References===
====Edexcel====
:[https://www.amazon.co.uk/gp/product/1292120193/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=1292120193&linkCode=as2&tag=nrjc-21&linkId=572df39392fb4200db8391d98ae6314e ''Biology core practicals; light intensity and photosynthesis, pages 90-91, GCSE Combined Science, Pearson Edexcel '']