NEET Biology question
Consider the following statements about sewage treatment: I. Primary treatment is purely a physical process. II. Secondary treatment is a biological process involving aerobic microbes. III. BOD measures the amount of organic matter in a water sample. IV. A lower BOD indicates a more heavily polluted water sample. Which of the above statements are correct?
Answer: (A)
Solution
Statements I, II and III are correct; statement IV is wrong, because a LOWER BOD actually
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