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Students performed an investigation to compare the effectiveness of two water treatments for purifying pond water - HSC - SSCE Biology - Question 5 - 2007 - Paper 1
Question 5
Students performed an investigation to compare the effectiveness of two water treatments for purifying pond water. Three samples of pond water, A, B and C, were col... show full transcript
Worked Solution & Example Answer:Students performed an investigation to compare the effectiveness of two water treatments for purifying pond water - HSC - SSCE Biology - Question 5 - 2007 - Paper 1
Step 1
What is the dependent variable in this investigation?
Answer
The dependent variable in this experiment is the outcome that is measured to assess the effectiveness of the water treatments. In this context, it refers to the number of visible bacterial colonies on the agar plates after treatment. The purpose of the investigation is to see how different treatments affect the quantity of bacterial growth, which makes (B) the correct answer.