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Hi, I did this excellent experiment recently teaching my AS level Biology students. Your conclusion is correct, and I have added a few extra points that you & your family friend may find useful :
Permeability increases well below 55C - you will see an increase from 0C upwards as the fluidity of the membrane increases.
This is an experiment that can give good or rubbish results. Rubbish comes from:
At this time of year in particular, plants are changing their membrane make-up to acclimatize for winter which can affect results. Cells in different parts of the beetroot are changing at a different rate, so causing "noise" from the above effects.
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