A new product has been developed to kill pathogens in drinking water - HSC - SSCE Biology - Question 19 - 2008 - Paper 1
Question 19
A new product has been developed to kill pathogens in drinking water.
Design an experiment to test the effectiveness of the product.
Worked Solution & Example Answer:A new product has been developed to kill pathogens in drinking water - HSC - SSCE Biology - Question 19 - 2008 - Paper 1
Step 1
Identify Control and Experimental Groups
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Answer
Set up two groups of water samples: one group will contain the new product (experimental group) and the other will not (control group). Ensure both groups are identical in volume and pathogen levels before treatment.
Step 2
Apply Treatment
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Introduce the product to the experimental group according to the manufacturer's instructions, while leaving the control group untreated. Include a range of concentrations to assess any dose-dependent effects.
Step 3
Measure Effectiveness
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After a predetermined time (e.g., 24 hours), measure the levels of pathogens in both groups using appropriate microbiological methods, such as plating on agar or using a spectrophotometer.
Step 4
Analyze Data
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Compare the pathogen levels between the control and experimental groups. If the experimental group's pathogen levels are significantly lower, this indicates the product is effective at killing pathogens.
