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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 hydrogen carbonate indicator was placed in each of three test tubes. Gauze was placed in each te... 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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Use the same volume of red hydrogen carbonate indicator in each test tube: This would ensure that the initial conditions for detecting changes in carbon dioxide concentration are uniform across all test tubes.
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Ensure that the temperature is kept constant for all test tubes: Temperature can affect the rate of respiration, so maintaining the same temperature would help in obtaining more reliable and comparable results.