Sewage Composition and Health Hazards — NEET Biology
📚 Practice ConceptWhat is sewage? In which way can sewage be harmful to us?
Assertion (A): Secondary sewage treatment produces effluent with significantly reduced pollution potential. Reason (R): Aerobic microbes consume organic matter in the effluent, which significantly reduces its BOD.
View solution & NCERT explanation
Correct answer: A — If both assertion and reason are true and the reason is the correct explanation of the assertion.
Both statements are true from NCERT. NCERT states that aerobic microbes consume organic matter and “This significantly reduces the BOD of the effluent.” The Reason explains WHY the pollution potential in the Assertion is reduced - because BOD (biological oxygen demand) directly correlates with polluting potential, and microbial consumption lowers BOD.
What does NCERT say about What sewage which way?
Has this concept appeared in NEET?
Which chapter is this from?
Through deep analysis of NEET and NTA, 176 of the 180 ReNEET 2026 (June 21) questions were already in the MedicNEET question bank before the exam.
176/180MedicNEET's Biology question bank is built from the same NCERT lines NTA picks repeatedly. Not random MCQs — questions crafted exactly like NTA crafts them.