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A student investigated respiration in three different organisms - Edexcel - GCSE Biology Combined Science - Question 2 - 2019 - Paper 1
Question 2
A student investigated respiration in three different organisms. Red hydrogen carbonate indicator was placed in each of three test tubes. Gauze was placed in each ... show full transcript
Worked Solution & Example Answer:A student investigated respiration in three different organisms - Edexcel - GCSE Biology Combined Science - Question 2 - 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 that all test tubes have the same concentration of red hydrogen carbonate indicator to maintain uniformity in the measurement of respiration rates.
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Use the same mass of organisms in each test tube to create a fair comparison of respiration between different organisms.