Biology Edexcel Practicals A

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Biology Edexcel Practicals A 1

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Biology Edexcel Practicals A Level Questions With Complete Solutions

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Biology Edexcel Practicals A Level Questions With Complete Solutions 1. Investigate the effect of caffeine on heart rate of Daphnia - Topic 1 Daphnia of same species and volume Placed on microscopic tray in pond water in bits of cotton and allowed to acclimatise for 5 minutes Then HR counted using tally marks of a sheet of paper for 15 seconds, x4 to give hr/min repeated with unknown conc. of caffeine (blind) 0.0% and distilled water, 0.1% and 0.5% Repeat with each daphnia and with othe...

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Biology Edexcel Practicals A • Biology Edexcel Practicals A