NEET Biology question

Which of the following statements correctly contrasts primary and secondary sewage treatment?

(A)Primary treatment is physical, while secondary treatment is biologicalCorrect
(B)Primary treatment is biological, while secondary treatment is physical
(C)Both primary and secondary treatment are purely chemical processes
(D)Neither stage involves any microbial activity

Answer: (A)

Solution

Primary treatment of sewage is a physical process (filtration and sedimentation), whereas secondary

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Question ID VK-124454