This chapter explains the contributions of microbes to human welfare, highlighting their roles in everyday life, industry, and environmental management.
Microbes in Human Welfare - Quick Look Revision Guide
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Key Points
Define microbes and their types.
Microbes include bacteria, viruses, fungi, and protozoa, present everywhere.
Role of Lactobacillus in curd formation.
Lactobacillus ferments lactose in milk to produce lactic acid, turning it into curd.
Fermentation process in bread-making.
Yeast Saccharomyces cerevisiae ferments sugars, producing carbon dioxide that leavens bread.
What is penicillin?
Penicillin, discovered by Fleming, is an antibiotic produced by Penicillium notatum to kill bacteria.
Importance of antibiotics in medicine.
Antibiotics treat infections, revolutionizing healthcare since their discovery, decreasing mortality rates.
Define biofertilizers.
Biofertilizers are live microorganisms that enhance soil fertility by fixing atmospheric nitrogen.
Examples of biofertilizers.
Rhizobium in legumes, Azospirillum, and cyanobacteria like Nostoc enhance soil nutrient levels.
Biogas production and its benefits.
Biogas, mainly methane, is produced by anaerobic bacteria decomposing organic matter, utilized as fuel.
Explain activated sludge process.
In sewage treatment, aerobic microbes digest waste, forming 'flocs' that reduce biochemical oxygen demand (BOD).
Role of Trichoderma in agriculture.
Trichoderma fungus acts as a biocontrol agent, suppressing plant pathogens and enhancing growth.
Microbes as biocontrol agents.
Natural predators, such as ladybirds and Bt bacteria, maintain pest populations without harmful chemicals.
Uses of yeast in industrial products.
Yeasts ferment malted grains and fruits to produce beverages like beer and wine, generating ethanol.
Microbial enzymes in industry.
Enzymes like lipases and proteases from microbes are used in laundry detergents and food clarifications.
Definition and importance of BOD.
BOD measures organic matter in water; high BOD indicates pollution levels, vital for sewage treatment.
Process of sewage treatment.
Sewage undergoes primary (filtration) and secondary (biological) treatments to reduce pollution before discharge.
Importance of cyanobacteria in agriculture.
Cyanobacteria contribute biofertilizers, fix nitrogen, and improve soil organic matter, essential for crops.
Fermentation in food preservation.
Fermentation preserves foods, enhancing their safety and nutritional value, examples include pickles and cheese.
Microbes and disease causation.
While many microbes cause diseases, beneficial ones also play crucial roles in health and nutrition.
Define viroids and prions.
Viroids are infectious RNA molecules; prions are misfolded proteins causing neurodegenerative diseases.
Misconception about all microbes being harmful.
Not all microbes are pathogenic; many are essential for digestion, fermentation, and ecological balance.
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