Question detail
What is the main reason waste water must be treated before being released into the environment?
Try the question, check the answer, then read the explanation to understand the curriculum point.
At a glance
MCQ
Type
practice
Style
Topic
Using the Earth's resources and obtaining potable water
Question
- A. To remove organic matter and harmful microbes
- B. To increase its salt content
- C. To enhance its color
- D. To add nutrients for plants
Answer
The correct option is To remove organic matter and harmful microbes. This answer is correct because it matches the approved learning objective to compare the relative ease of obtaining potable water from waste water, ground water and salt water in the subtopic Waste water treatment.
Explanation
The correct option is To remove organic matter and harmful microbes. To remove organic matter and harmful microbes is correct because it directly supports the approved learning objective to compare the relative ease of obtaining potable water from waste water, ground water and salt water. This belongs to the subtopic Waste water treatment within Using the Earth's resources and obtaining potable water, so the explanation must stay tied to that curriculum context. The other options are incorrect because they either do not answer this learning objective, use a vague statement, or move away from Waste water treatment.
Common mistake
Confusing Water Sources
Students often confuse the ease of obtaining potable water from waste water with that from ground water and salt water, thinking they are equally easy to treat.
Do not treat this as a general statement about waste water. Instead, answer by clearly linking the correction to compare the relative ease of obtaining potable water from waste water, ground water and salt water in Waste water treatment. This keeps the response inside Using the Earth's resources and obtaining potable water and prevents a vague or off-topic GCSE answer. The mistake to avoid is: students often confuse the ease of obtaining potable water from waste water with that from ground water and salt water, thinking they are equally easy to treat.
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