https://www.khanacademy.org/science/bmc-grade-9-science/x345505a97fc4a662:useful-and-harmful-microorganisms/x345505a97fc4a662:antibiotics/v/antibiotics 2025-09-03T10:00:42.682314963Z Antibiotics Antibiotics are one of the greatest discoveries in science—but did you know their story begins with something as ordinary (and gross!) as mould? In this video, we’ll explore: 🔹 How people in ancient Egypt were already using bread mold to heal wounds. 🔹 The accidental discovery of Penicillin by Alexander Fleming. 🔹 How antibiotics fight bacteria inside our bodies. 🔹 Why antibiotics don’t work on viral infections (like colds & flu). 🔹 The big danger of antibiotic resistance—and what we can do about it. Bitasta Datta video https://cdn.kastatic.org/googleusercontent/ZCdwTudJg6e6n-P2gsaUborP4izvMsGo71pvEVlX9dNYWcLXcP7VHkWpn2grt4TUP1KoJLQP9NswyHBuBLSFTBw Antibiotics Antibiotics are one of the greatest discoveries in science—but did you know their story begins with something as ordinary (and gross!) as mould? In this video, we’ll explore: 🔹 How people in ancient Egypt were already using bread mold to heal wounds. 🔹 The accidental discovery of Penicillin by Alexander Fleming. 🔹 How antibiotics fight bacteria inside our bodies. 🔹 Why antibiotics don’t work on viral infections (like colds & flu). 🔹 The big danger of antibiotic resistance—and what we can do about it. https://cdn.kastatic.org/ka-youtube-converted/4KwCIvp2rQU.mp4/4KwCIvp2rQU.mp4 401 Chemistry in healthcare, industrial products, and food https://www.khanacademy.org/science/cambridge-o-level-biology-cie/x2a084a90105205d2:disease-and-immunity/x2a084a90105205d2:antibiotics/v/antibiotics-useful-and-harmful-microbes-grade-9-science-khan-academy-1080p 2026-04-20T05:10:45.627247989Z Antibiotics-Useful and Harmful Microbes Antibiotics useful and harmful microbes Khan Academy Pakistan video https://cdn.kastatic.org/googleusercontent/ZCdwTudJg6e6n-P2gsaUborP4izvMsGo71pvEVlX9dNYWcLXcP7VHkWpn2grt4TUP1KoJLQP9NswyHBuBLSFTBw Antibiotics-Useful and Harmful Microbes Antibiotics useful and harmful microbes https://cdn.kastatic.org/ka-youtube-converted/XLeIMjwfZhQ.mp4/XLeIMjwfZhQ.mp4 401 Chemistry in healthcare, industrial products, and food https://www.khanacademy.org/science/cambridge-o-level-biology-cie/x2a084a90105205d2:disease-and-immunity/x2a084a90105205d2:antibiotics/e/antibiotics 2026-06-10T08:20:44.579273075Z Antibiotics This exercise dives deep into the fascinating world of antibiotics—not just what they are, but how they work, when they should (and shouldn't!) be used, and the science stories behind their discovery. Bitasta Datta exercise https://www.khanacademy.org/science/strengthened-shs-general-science-3-terms/x381269a1083161e8:physics/x381269a1083161e8:chemical-substances-in-the-household-and-personal-care-products/e/microbes-and-enzymes 2025-02-06T05:32:11.208946943Z Microbes and enzymes Microbes in the commercial production of enzymes Moumita Sen exercise https://www.khanacademy.org/science/strengthened-shs-general-science-3-terms/x381269a1083161e8:physics/x381269a1083161e8:chemical-substances-in-the-household-and-personal-care-products/v/microbes-in-industrial-products 2024-10-29T06:40:31.845787447Z Microbes in Industrial Products It's time we talk about useful microbes, especially the ones used in large-scale industries! Where are they used and for what are they used? What beneficial products do we get from microbes? Watch this video to learn more about microbes in industrial products. Nivedhitha Suresh video https://cdn.kastatic.org/googleusercontent/ZCdwTudJg6e6n-P2gsaUborP4izvMsGo71pvEVlX9dNYWcLXcP7VHkWpn2grt4TUP1KoJLQP9NswyHBuBLSFTBw Microbes in Industrial Products It's time we talk about useful microbes, especially the ones used in large-scale industries! Where are they used and for what are they used? What beneficial products do we get from microbes? Watch this video to learn more about microbes in industrial products. https://cdn.kastatic.org/ka-youtube-converted/NoqIC24PIqM.mp4/NoqIC24PIqM.mp4 484 Chemistry in healthcare, industrial products, and food https://www.khanacademy.org/science/strengthened-shs-general-science-3-terms/x381269a1083161e8:physics/x381269a1083161e8:chemical-substances-in-the-household-and-personal-care-products/e/microbes-and-enzymes-up 2026-06-05T07:10:41.031998951Z Microbes in industrial products Microbes and enzymes Moumita Sen exercise https://www.khanacademy.org/science/kn-class-7-science/x2edacdad2354c760:wastewater-story/x2edacdad2354c760:treatment-plant/v/microbial-pollution-control-sewage-management 2025-12-04T06:30:51.593616006Z Microbial Pollution Control & Sewage Management In this video, you'll explore how microbes—though often helpful—can become pollutants when ecosystems are overloaded. Learn how landfills and contaminated water contribute to microbial growth that harms soil and water quality. Khan Academy video https://cdn.kastatic.org/googleusercontent/ZCdwTudJg6e6n-P2gsaUborP4izvMsGo71pvEVlX9dNYWcLXcP7VHkWpn2grt4TUP1KoJLQP9NswyHBuBLSFTBw Microbial Pollution Control & Sewage Management In this video, you'll explore how microbes—though often helpful—can become pollutants when ecosystems are overloaded. Learn how landfills and contaminated water contribute to microbial growth that harms soil and water quality. https://cdn.kastatic.org/ka-youtube-converted/gmK5gjLhpaI.mp4/gmK5gjLhpaI.mp4 425 Chemistry in healthcare, industrial products, and food https://www.khanacademy.org/science/strengthened-shs-general-science-3-terms/x381269a1083161e8:physics/x381269a1083161e8:chemical-substances-in-the-household-and-personal-care-products/a/methanogens-and-biogas 2022-03-29T12:31:27.221135071Z Methanogens and biogas Overview of microorganisms that produce methane, and their use in biogas production. article https://www.khanacademy.org/science/strengthened-shs-general-science-3-terms/x381269a1083161e8:physics/x381269a1083161e8:chemical-substances-in-the-household-and-personal-care-products/e/microbes-for-a-cleaner-future-biofuels-waste-control-and-green-farming 2026-06-05T07:10:41.031998951Z Microbes for a Cleaner Future: Biofuels, Waste Control and Green Farming Explore how microbes make fuels, clean sewage, control pollution, and boost farming naturally - all from Class 10 Microbiology, Chapter 7: Introduction to Microbiology. Yajurva Joshi exercise https://www.khanacademy.org/science/strengthened-shs-general-science-3-terms/x381269a1083161e8:physics/x381269a1083161e8:chemical-substances-in-the-household-and-personal-care-products/v/sewage-treatment 2022-11-14T07:26:27.71998385Z Sewage Treatment In this video, we find out what really happens after you flush down last night's dinner. We discover the importance of microbes in sewage treatment and how we have shaped a critical process around it. Sulagna Das video https://cdn.kastatic.org/googleusercontent/ZCdwTudJg6e6n-P2gsaUborP4izvMsGo71pvEVlX9dNYWcLXcP7VHkWpn2grt4TUP1KoJLQP9NswyHBuBLSFTBw Sewage Treatment In this video, we find out what really happens after you flush down last night's dinner. We discover the importance of microbes in sewage treatment and how we have shaped a critical process around it. https://cdn.kastatic.org/ka-youtube-converted/t2cQXfnwLQ0.mp4/t2cQXfnwLQ0.mp4 749 Chemistry in healthcare, industrial products, and food https://www.khanacademy.org/science/strengthened-shs-general-science-3-terms/x381269a1083161e8:physics/x381269a1083161e8:chemical-substances-in-the-household-and-personal-care-products/e/microbes-in-sewage-treatment 2024-08-15T06:51:54.562347673Z Microbes in sewage treatment Sewage treatment involving biochemical oxygen demand (BOD), primary and activated sludge, different stages of treatment, and aerobic vs anaerobic digestion. mahathi exercise https://www.khanacademy.org/science/shs-physical-science/x0492729e402f0c6b:unit-1-name/x0492729e402f0c6b:chemistry-in-household-and-personal-care-products/v/baking-soda-acids-bases-and-salts-chemistry-khan-academy 2020-07-21T06:02:35Z Baking soda Let's see how is baking soda formed and what are its uses. Ram Prakash video https://cdn.kastatic.org/googleusercontent/pNNEe5ZtQde0LQdA9Bg3p2LPPIZAMcwFpz4Gq9aEbYJu4tK1RrMwWi-bpvk7M0fucI6xzxROVxQut0lBvHYZe1U Baking soda Let's see how is baking soda formed and what are its uses. https://cdn.kastatic.org/ka-youtube-converted/UHRIptTczTI.mp4/UHRIptTczTI.mp4 466 Chemistry in healthcare, industrial products, and food https://www.khanacademy.org/science/shs-physical-science/x0492729e402f0c6b:unit-1-name/x0492729e402f0c6b:chemistry-in-household-and-personal-care-products/v/bleaching-powder-acids-bases-and-salts-chemistry-khan-academy 2020-07-21T06:02:27Z Bleaching powder Let's see how bleaching powder is made and where it's used. Ram Prakash video https://cdn.kastatic.org/googleusercontent/Cmc5Dk2wkWBh9IaB4Rpg4CFE1gzAfvA-hVvxdMehiTugZkieboCZvcjM9EUS2CD0BgrMNdirjavSxnsyOyehEBc Bleaching powder Let's see how bleaching powder is made and where it's used. https://cdn.kastatic.org/ka-youtube-converted/eKqiGlf4XhU.mp4/eKqiGlf4XhU.mp4 374 Chemistry in healthcare, industrial products, and food https://www.khanacademy.org/science/shs-physical-science/x0492729e402f0c6b:unit-1-name/x0492729e402f0c6b:chemistry-in-household-and-personal-care-products/v/washing-soda 2020-07-21T06:02:26Z Washing soda Let's see how is washing soda formed and what are its uses. video https://cdn.kastatic.org/googleusercontent/dae_bNyKBRs1LzN8bi0q1VvyO4Uh2TftCcN4IW3UbMTRyLESAFwkzaixW5Rd2E96McOtXaMU5gbER6BCZEkCfBM Washing soda Let's see how is washing soda formed and what are its uses. https://cdn.kastatic.org/ka-youtube-converted/SsUemSnD_-M.mp4/SsUemSnD_-M.mp4 385 Chemistry in healthcare, industrial products, and food https://www.khanacademy.org/science/shs-physical-science/x0492729e402f0c6b:unit-1-name/x0492729e402f0c6b:chemistry-in-household-and-personal-care-products/a/who-am-i 2021-04-29T07:59:40Z Identify chemicals based on their uses (recall) article https://www.khanacademy.org/science/cambridge-o-level-chemistry-cie/x8bc8fb44369617ed:acids-bases-and-salts/x8bc8fb44369617ed:preparation-of-salts/e/uses-of-common-salts 2026-03-28T12:05:05.381528741Z Identify chemicals based on their uses Let's practice identifying some of the common salts based on their applications. exercise https://www.khanacademy.org/science/strengthened-shs-general-science-3-terms/x381269a1083161e8:physics/x381269a1083161e8:chemical-substances-in-the-household-and-personal-care-products/e/microbes-in-household-products 2025-01-17T06:04:50.282977546Z Microbes in household products Microbes in household products Moumita Sen exercise https://www.khanacademy.org/science/biology/cellular-respiration-and-fermentation/variations-on-cellular-respiration/v/lactic-acid-fermentation 2023-09-14T11:22:40.102153098Z Lactic acid fermentation Glycolysis breaks down glucose into two pyruvate molecules, producing ATP and reducing NAD to NADH. If oxygen is unavailable, lactic acid fermentation occurs, recycling pyruvate and NADH to produce more NAD+ for glycolysis. This process is common in organisms like lactobacillus, which is used in making yogurt, kimchi, and sauerkraut. Sal Khan video https://cdn.kastatic.org/googleusercontent/1A2fjm8uHMUaj7kDKXEuJPd8csAaSw629dfONoEmgqTH3dZW8poafZwSHp_5QRMQEVBwnr5t7keByoEb91mug83Y Lactic acid fermentation Glycolysis breaks down glucose into two pyruvate molecules, producing ATP and reducing NAD to NADH. If oxygen is unavailable, lactic acid fermentation occurs, recycling pyruvate and NADH to produce more NAD+ for glycolysis. This process is common in organisms like lactobacillus, which is used in making yogurt, kimchi, and sauerkraut. https://cdn.kastatic.org/ka-youtube-converted/lfeXuK8pbFw.mp4/lfeXuK8pbFw.mp4 682 Chemistry in healthcare, industrial products, and food https://www.khanacademy.org/science/grade-6-science-snc-aligned/x19bc096754f0b9af:technology-in-everyday-life/x19bc096754f0b9af:preparation-of-milk-products/v/bacteria-in-yogurt-fermentation-ur 2025-08-07T23:35:51.501752344Z Bacteria in Yogurt Fermentation Created by Khan Academy video https://cdn.kastatic.org/googleusercontent/ZCdwTudJg6e6n-P2gsaUborP4izvMsGo71pvEVlX9dNYWcLXcP7VHkWpn2grt4TUP1KoJLQP9NswyHBuBLSFTBw Bacteria in Yogurt Fermentation Created by Khan Academy https://cdn.kastatic.org/ka-youtube-converted/5_BY0j92k6o.mp4/5_BY0j92k6o.mp4 489 Chemistry in healthcare, industrial products, and food https://www.khanacademy.org/science/strengthened-shs-general-science-3-terms/x381269a1083161e8:physics/x381269a1083161e8:chemical-substances-in-the-household-and-personal-care-products/v/cheese-microbiology 2022-10-10T07:40:26.616749436Z Cheese microbiology In this video, we get a little cheesy. We talk about how different cheese is from curd/yogurt and which microbes help in creating the most delicious pizza topping ever. Sulagna Das video https://cdn.kastatic.org/googleusercontent/ZCdwTudJg6e6n-P2gsaUborP4izvMsGo71pvEVlX9dNYWcLXcP7VHkWpn2grt4TUP1KoJLQP9NswyHBuBLSFTBw Cheese microbiology In this video, we get a little cheesy. We talk about how different cheese is from curd/yogurt and which microbes help in creating the most delicious pizza topping ever. https://cdn.kastatic.org/ka-youtube-converted/t_EkzWr4SoU.mp4/t_EkzWr4SoU.mp4 381 Chemistry in healthcare, industrial products, and food https://www.khanacademy.org/science/cambridge-o-level-biology-cie/x2a084a90105205d2:respiration/x2a084a90105205d2:anaerobic-respiration/a/lactic-acid-and-alcohol-fermentation 2022-03-29T13:57:08.96832312Z Lactic acid and alcohol fermentation Overview of the lactic acid and alcohol fermentation pathways, and their use in making industrial products. article https://www.khanacademy.org/science/strengthened-shs-general-science-3-terms/x381269a1083161e8:physics/x381269a1083161e8:chemical-substances-in-the-household-and-personal-care-products/e/microbes-and-fermentation 2024-08-15T06:51:54.562347673Z Microbes and fermentation Lactic acid fermentation in yogurt, cheese, alcohol, and bread production. mahathi exercise https://www.khanacademy.org/science/strengthened-shs-general-science-3-terms/x381269a1083161e8:physics/x381269a1083161e8:chemical-substances-in-the-household-and-personal-care-products/e/microbes-used-in-food-production 2026-06-05T07:10:41.031998951Z Microbes used in Food production Explore how microbes like Lactobacillus, yeast, and Acetobacter help make yoghurt, cheese, bread, and vinegar through fermentation. Learn key food production processes from Class 10 Microbiology in an interactive way! Yajurva Joshi exercise https://www.khanacademy.org/science/bmc-grade-9-science/x345505a97fc4a662:useful-and-harmful-microorganisms/x345505a97fc4a662:yeast/v/yeast 2025-09-03T10:00:42.682314963Z Yeast Discover the life of yeast—a tiny unicellular fungus that makes bread fluffy and helps brew beverages. Bitasta Datta video https://cdn.kastatic.org/googleusercontent/ZCdwTudJg6e6n-P2gsaUborP4izvMsGo71pvEVlX9dNYWcLXcP7VHkWpn2grt4TUP1KoJLQP9NswyHBuBLSFTBw Yeast Discover the life of yeast—a tiny unicellular fungus that makes bread fluffy and helps brew beverages. https://cdn.kastatic.org/ka-youtube-converted/HgRYMpJfX1o.mp4/HgRYMpJfX1o.mp4 287 Chemistry in healthcare, industrial products, and food https://www.khanacademy.org/science/bmc-grade-9-science/x345505a97fc4a662:useful-and-harmful-microorganisms/x345505a97fc4a662:yeast/e/yeast 2026-06-15T04:30:38.969568377Z Yeast In this exercise, you’ll explore how a single-celled fungus like yeast can play a massive role in our daily lives — from making soft bread and fruity wines to producing clean fuel and cleaning up pollution. Bitasta Datta exercise https://www.khanacademy.org/science/bmc-grade-9-science/x345505a97fc4a662:useful-and-harmful-microorganisms/x345505a97fc4a662:antibiotics/e/useful-microbes 2026-06-15T04:30:38.969568377Z Useful microbes Learn how microbes help in making curd, bread, and fertile soil. This exercise from Chapter 8 “Useful and Harmful Microbes” covers Lactobacillus, Yeast, and Rhizobium with image-based and applied questions. Students explore fermentation, nitrogen fixation, and real-life examples of symbiotic relationships that benefit food and farming. Yajurva Joshi exercise https://www.khanacademy.org/science/strengthened-shs-general-science-3-terms/x381269a1083161e8:physics/x381269a1083161e8:chemical-substances-in-the-household-and-personal-care-products/e/microbes-in-industry-and-health 2026-06-05T07:10:41.031998951Z Microbes in Industry and Health Discover how microbes help make medicines, enzymes, and beverages! Learn about probiotics, fermentation, and antibiotic production in this interactive Class 10 Microbiology exercise. Yajurva Joshi exercise