Class 12 Biology - ODISHA
Microbes in Human Welfare
Microbes in Human Welfare for Class 12 Odisha BSE Biology explores the beneficial aspects of microorganisms in daily life, industry, agriculture, and medicine. Students learn about household food production like curd and bread, industrial applications using fermentors, sewage treatment processes, biofertilizers, and biocontrol agents. This chapter is highly scoring in board examinations, bridging theoretical microbiology with real-world biotechnology applications. Mastering this chapter requires memorizing specific scientific names of microbes and their exact commercial products, which frequently appear in both objective and long-answer questions on the BSE Odisha board papers.
Start Learning FreeKey Concepts
Microbes in Household Products
Lactic Acid Bacteria (LAB) like Lactobacillus convert milk to curd, improving its nutritional quality by increasing vitamin B12. Baker's yeast (Saccharomyces cerevisiae) is used to ferment dough for bread and idli.
Industrial Production and Fermentors
Microbes are grown on a large scale in vessels called fermentors to produce beverages and antibiotics. For example, Aspergillus niger produces citric acid, and Acetobacter acetic produces acetic acid.
Antibiotics Production
Antibiotics are chemical substances produced by microbes that kill or retard the growth of other disease-causing microbes. Penicillin, discovered by Alexander Fleming from Penicillium notatum, was the first antibiotic.
Sewage Treatment
Municipal wastewater is treated in two stages: primary treatment (physical removal of particles) and secondary treatment (biological degradation using aerobic and anaerobic microbes) before safe release into water bodies.
Biocontrol and Biofertilizers
Microbes act as eco-friendly alternatives to chemical pesticides and fertilizers. Bacillus thuringiensis controls butterfly caterpillars, and Rhizobium, Azospirillum, and Mycorrhiza enrich soil nutrients naturally.
Important Formulas
Board Exam Info
In the Odisha (BSE) Class 12 Biology examination, this chapter typically carries around 4 to 6 marks. Questions usually include multiple-choice questions (MCQs), short answer questions requiring specific microbe-product pairs, and 3-mark questions explaining sewage treatment or biofertilizers.
Frequently Asked Questions
What are the scientific names I must memorize for this chapter?
You must memorize key pairs like Lactobacillus for curd, Saccharomyces cerevisiae for bread and ethanol, Aspergillus niger for citric acid, Acetobacter acetic for acetic acid, Clostridium butylicum for butyric acid, and Trichoderma polysporum for Cyclosporin A.
What is the difference between primary and secondary sewage treatment?
Primary treatment is a physical process involving filtration and sedimentation to remove floating and grit particles. Secondary treatment is a biological process where aerobic and anaerobic microbes break down the organic matter present in the primary effluent.
How do Mycorrhiza act as biofertilizers?
Mycorrhiza are symbiotic associations between fungi and roots of higher plants. The fungal symbiont absorbs phosphorus from soil and passes it to the plant, while also providing resistance to root-borne pathogens and drought.
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