Microbes in Human Welfare: Class 12 Biology (CBSE) important questions and practice
Microbes in Human Welfare is chapter 8 of 13 in CBSE Class 12 Biology. Below are the topics the paper draws from, the question types that come up again and again, and a free practice test on this chapter alone.
Topics in this chapter
- Microbes in household products: Lactobacillus, Saccharomyces cerevisiae, toddy, cheese (Swiss, Roquefort)
- Industrial products: beverages, antibiotics (penicillin by Fleming, Chain and Florey)
- Chemicals, enzymes and bioactive molecules: citric acid, statins, cyclosporin A, streptokinase
- Sewage treatment: primary and secondary (activated sludge, BOD, anaerobic sludge digesters)
- Biogas production (methanogens) and microbes as biocontrol agents (Bt, Trichoderma, Baculoviruses)
- Microbes as biofertilisers: Rhizobium, Azospirillum, mycorrhiza, cyanobacteria
What examiners usually ask
- Describe the secondary treatment of sewage and explain the significance of BOD
- Name the microbes that produce cyclosporin A, statins and streptokinase and state their uses
- How do biofertilisers enrich the soil? Give examples of free-living and symbiotic nitrogen fixers
Exam tip
Prepare a microbe-product-use table because the matching and one-word questions are drawn from it, and explain BOD as a measure of organic matter (higher BOD means more polluted water) with the role of flocs in the aeration tank.
Microbes in Human Welfare on other boards and exams
Frequently asked questions
What are the important questions from Microbes in Human Welfare for CBSE Class 12?
The question types listed above repeat most often in CBSE Class 12 Biology papers for this chapter. Practise them with the chapter test and then attempt them inside a full previous-year paper under time.
Is Microbes in Human Welfare in the CBSE Class 12 Biology syllabus?
Yes. Microbes in Human Welfare is part of the current CBSE Class 12 Biology syllabus, as listed on this site from the prescribed textbook.
Can I practise Microbes in Human Welfare MCQs in Hindi?
Yes. The chapter test and explanations are available in Hindi and English, with an AI doubt solver for any question.