Other than those stated, suggest two variables the student needed to keep constant in her investigation - AQA - A-Level Biology - Question 2 - 2023 - Paper 3
Question 2
Other than those stated, suggest two variables the student needed to keep constant in her investigation.
1.
2.
Worked Solution & Example Answer:Other than those stated, suggest two variables the student needed to keep constant in her investigation - AQA - A-Level Biology - Question 2 - 2023 - Paper 3
Step 1
1. Suggest a variable
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Answer
One variable that the student needed to keep constant could be the concentration of glucose in the solution. This would ensure that any changes observed in carbon dioxide production were solely due to the yeast's respiration rate and not variations in substrate availability.
Step 2
2. Suggest another variable
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Answer
Another variable could be the temperature of the environment during the experiment. Temperature fluctuations could affect yeast metabolism and, consequently, the rate of carbon dioxide production.
