Microbes in Human Welfare

The many useful roles of microbes - a high-scoring, largely fact-based NEET chapter (typically 2-4 questions/year) built around 'which microbe does what'. It covers microbes in household products (lactic acid bacteria in curd, cheeses, baker's yeast in dough, toddy) and in industrial products (fermented beverages, antibiotics such as penicillin, organic acids, enzymes and bioactive molecules like cyclosporin A and statins); microbes in sewage treatment (primary and secondary treatment, BOD, activated sludge and anaerobic digesters) and in the production of biogas (methanogens); and microbes as biocontrol agents (Bacillus thuringiensis, Trichoderma, baculoviruses) and as biofertilisers (Rhizobium, mycorrhiza and cyanobacteria). Six graded practice sets - two Easy, two Medium, one Hard and one NEET previous-year set - each opening with comprehensive NCERT-anchored notes covering 100% of the current syllabus, followed by single-correct MCQs with full explanations.