Fermented Foods & Microbial Role — NEET Biology
📚 Practice ConceptName some traditional Indian foods made of wheat, rice and Bengal gram (or their products) which involve use of microbes.
Match the following stages of sewage treatment with their characteristic process and primary outcome: Column I (Stage) A. Primary Treatment B. Secondary Treatment (Aeration Tank) C. Anaerobic Sludge Digester D. Activated Sludge E. Treated Effluent Column II (Characteristic Process) I. Vigorous growth of useful aerobic microbes II. Physical removal of large and small particles III. Anaerobic digestion by methanogens IV. Settled bacterial flocs V. Release into natural water bodies Column III (Primary Outcome/Product) 1. Significant reduction in BOD 2. Biogas production (CH₄, CO₂, H₂S) 3. Formation of primary sludge 4. Reduced polluting potential 5. Serves as inoculum Which of the following combinations is correctly matched?
View solution & NCERT explanation
Correct answer: A — A-II-3, B-I-1, C-III-2, D-IV-5, E-V-4
The core concept involves understanding the different stages of sewage treatment and their associated processes and outcomes. Primary treatment involves the physical removal of solids (II) leading to the formation of primary sludge (3). Secondary treatment in aeration tanks involves vigorous growth of useful aerobic microbes (I) which significantly reduces the BOD (1). Anaerobic sludge digesters facilitate anaerobic digestion by methanogens (III) producing biogas (CH₄, CO₂, H₂S) (2). Activated sludge consists of settled bacterial flocs (IV) and a small part is used as inoculum (5) for the aeration tank. The treated effluent is released into natural water bodies (V) as its polluting potential is reduced (4). Option A correctly matches all these aspects: A-II-3 (Primary Treatment - Physical removal - Primary sludge), B-I-1 (Secondary Treatment - Aerobic microbial growth - Reduced BOD), C-III-2 (Anaerobic Digester - Anaerobic digestion - Biogas production), D-IV-5 (Activated Sludge - Settled flocs - Inoculum), E-V-4 (Treated Effluent - Release - Reduced pollution). Options B, C, and D contain incorrect pairings for processes and outcomes, misrepresenting the sequence and characteristics of sewage treatment stages. Therefore, option A is the correct combination. Recap: The question tests the detailed understanding of processes, organisms, and outcomes at each stage of sewage treatment.
What does NCERT say about Name some traditional Indian?
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.