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If campers have to drink water from a creek, which is the best way of making the water safe to drink? (A) Boil the water for five minutes - HSC - SSCE Biology - Question 11 - 2001 - Paper 1
Question 11
If campers have to drink water from a creek, which is the best way of making the water safe to drink? (A) Boil the water for five minutes. (B) Filter the water thr... show full transcript
Worked Solution & Example Answer:If campers have to drink water from a creek, which is the best way of making the water safe to drink? (A) Boil the water for five minutes - HSC - SSCE Biology - Question 11 - 2001 - Paper 1
Step 1
Best way to make the water safe to drink
Answer
The best method to ensure water is safe for drinking is to boil the water for five minutes (Option A). Boiling water is effective in killing harmful microorganisms such as bacteria, viruses, and parasites that may be present in creek water. This process is widely recommended by health organizations for purifying water.
While filtering through a shirt (Option B) might remove some particulate matter, it does not eliminate pathogens. Letting water stand in a container (Option C) does not assure safety as it doesn’t kill microorganisms. Lastly, exposing water to ultraviolet rays (Option D) for two hours could have some effect, but it is less reliable than boiling, as it requires clear water and sufficient UV intensity.
Therefore, the correct choice is Option A: Boil the water for five minutes.