Microbes in Human Welfare — Prelims Strategy

Prelims Strategy

To effectively tackle questions from 'Microbes in Human Welfare' in NEET Prelims, a systematic approach is essential. Firstly, memorization of specific examples is paramount. Create tables or flashcards listing the microbe, its category (bacterium, fungus, virus), and its exact product or function.

For instance, link *Lactobacillus* to curd, *Saccharomyces cerevisiae* to bread/ethanol, *Penicillium notatum* to Penicillin, *Trichoderma polysporum* to Cyclosporin A, *Monascus purpureus* to Statins, *Bacillus thuringiensis* to insect control, *Rhizobium* to nitrogen fixation, and *Methanobacterium* to biogas.

Secondly, understand the underlying processes. For sewage treatment, visualize the steps: primary (physical) -> secondary (biological, aerobic flocs, BOD reduction) -> anaerobic sludge digestion (biogas). For biofertilizers, differentiate between symbiotic (e.g., *Rhizobium*) and free-living (e.g., *Azotobacter*) nitrogen fixers, and the role of mycorrhiza.

Thirdly, focus on the 'why' and 'how' for conceptual clarity. Why are biocontrol agents preferred over chemical pesticides? (Specificity, eco-friendliness). How do statins work? (Inhibit cholesterol synthesis enzyme).

Finally, practice MCQs regularly. Pay close attention to trap options, which often involve swapping microbes or their products. For numerical problems (rare in this chapter, but possible for BOD reduction percentages), ensure you understand the concept rather than just memorizing numbers. Always read the question carefully to identify keywords like 'free-living', 'symbiotic', 'aerobic', or 'anaerobic'.