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A student investigated respiration in three different organisms - Edexcel - GCSE Biology - Question 9 - 2019 - Paper 1
Question 9
A student investigated respiration in three different organisms. Red hydrogencarbonate indicator was placed in each of three test tubes. Gauze was placed in each t... show full transcript
Worked Solution & Example Answer:A student investigated respiration in three different organisms - Edexcel - GCSE Biology - Question 9 - 2019 - Paper 1
Step 1
State two ways this method could be improved to make the results for these three organisms more comparable.
Answer
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Ensure all organisms are of similar size and age to minimize biological variability that could affect respiration rates.
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Measure the initial conditions, like temperature and moisture levels, in each test tube before starting the experiment to ensure a controlled environment.