Microbes Control Bacterial Diseases — NEET Biology
📚 Practice ConceptIn which way have microbes played a major role in controlling diseases caused by harmful bacteria?
Which of the following statements are correct regarding the secondary treatment stage of sewage in a Sewage Treatment Plant (STP)? S1: Aeration tanks facilitate the vigorous growth of useful aerobic microbes, which form large masses called flocs. S2: Flocs are composed of bacteria associated with fungal filaments, which digest a major part of the organic matter in the effluent. S3: The primary purpose of aeration and agitation in the secondary treatment is to maintain anaerobic conditions crucial for microbial growth. S4: A significant reduction in the BOD of the effluent indicates successful removal of most of the inorganic contaminants. S5: The activated sludge formed in the settling tank, after BOD reduction, is entirely pumped into anaerobic sludge digesters. S6: Anaerobic digestion of the activated sludge results in the production of inflammable gases like methane, hydrogen sulphide, and carbon dioxide.
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