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00:00:45 Hello friends, you are watching the IIT Series of Biology and I Rikisha Bhowmik P PGT Biology at Kendriya Vidyalaya Sector to RK Puram is helping you in understanding some concepts of biology. Biology is the study of living organisms. When We Look Around As The Microscopic Life Forms Like Plants And Animals Are So Obvious. But There Are Certain Minute Organisms Always Present Almost Everywhere Around Us in Soil in Land in Plants in Animals Inside Our Bodies and Almost Everywhere They Are

00:01:23 Cosmopolitan All these organisms which are very small and not visible to us with our naked eyes are collectively known as microbes and microorganisms. And the fascinating branch of biology that deals with the study of microbes and their effect on us is microbiology. These Microbes Are Showing Amazing Ability. They Are They Show Amazing Ability and They Can Be Found in Other's Habitats. They can't be found in true extreme conditions where other life worms can't be found. For Example, They Can Be Found in Very Saline Areas,

00:02:03 Marsh areas, in vents, in hot thermal vents and they can always be found in true conditions in volcanoes and many true areas where we cannot imagine are self to survive. So, when we study about microorganisms, we most likely confine ourselves to their pathogenic effects. Wherever we hear about microbes, we fear hearing about them. Because most of the microbes we know are not known to cause diseases. They are pathogenic but so are all microorganisms harmful to us. Not all microorganisms are harmful to us. u


00:02:48 Will be surprised to know that most of the microorganisms are installed helpful to us. So today we will be learning more about this in detail in the chapter of class 12th Microbes in Human Welfare. Here you can see the figures of certain microorganisms. As I Said That These Microbes Are Present Everywhere and They Are Present in All the Three Domains Be it Archaea, UK and Bacteria. In figure 10.1 here you can see the bacteria of different shape, road shaped, spherical and this is a magnified version of a road shaped bacteria showing flagella as well. Look at these


00:03:36 Figure 10.2, You can see bacteriophage. A bacteriophage is a virus that infects bacteria. This is a picture of adenovirus which causes respiratory infections. And this is a magnified ah view of road shape tobacconzoic viruses. These viruses are dwarves. They can be bacteria, protozoa, fungi, viruses, viroids and as well as prions. Prions R Proteinaceous Infectious agents. These microbes can be cultured easily in nutritive medium where they form colonies. For Example in This Figure You Can See the Fungal

00:04:18 Colony growing in a culture medium in a nutrient medium. So the microbes are cosmopolitan to all the three domains they can all be cultured in order to study about them. So in this chapter we can divide the use of microorganisms into different parts. Microbes can be used in household products, industrial products, environmental cleaning, energy production and improving agriculture. All these applications are highly useful to humans. So, let's get started first one by one with the most common things we see


00:04:58 In our daily lives as household products. Wherever we think of household products, and the role of microbes, the first thing that comes to our mind is curd. Curd As You May Be Knowing That Curd Actually Contains Lactobacillus S The Bacteria. And other true bacteria which are collectively known as lactic acid bacteria LAB. These lactic acid bacteria have the potential to convert the milk. Can partially digest the milk. They can coagulate the milk and convert the lactose present in it into lactic acid. This Is How It Is

00:05:39 Formed. You must have seen your mother setting the curd at night. They just put a part of the cord which is known as inoculum. An inoculum is sufficient for setting of the cord. It can set the cord in a bowl of milk. A spoon of inoculum containing millions of lactic acid bacteria. So this is the most common application which VC in our houses of microbes in our life. The Next Thing We Observe is the Fermented Dr. You Must Have Seen Your Mothers Or Anybody Else At Your Home Fermenting Dough For Preparing Various Kind Of Foods Like Idli, Dosa, Bhaturaj,

00:06:22 Dhoklaz, Eketra. And all of these products can be formed only after fermentation of Dr. ahhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhh Fermentation is actually a metabolic pathway that occurs in the body of yeast. Yeast billows to fungi. Metabolic pathways. Let us look at the metabolic pathway that occurs in yeast. Which helps in fermentation and its application in the formation of these food products Metabolic pathway in yeast The glucose which is the substrate C6H12O6 + 2 ADP + 2 Inorganic phosphate in the cytoplasm of yeast gets converted into ethanol 00:07:33 C2H5OH with the release of carbon dioxide gas and a small amount of energy 2 ATP if we balance it it will become like this. This is ethanol and this is carbon dantu the anaerobic sludge digester. it's all mixed with the primary sludge v


00:30:30 Left in the primary treatment. This All This Ah Sludge Together Is Sent Into The Anaerobic Sludge Digester. The anaerobic sludge digester as the name suggests comprehends the anaerobic bacteria which will further digest the bacteria and the fungi in the sludge and it will produce a mixture of gases which is known as biogas. Biogas is a mixture of gases. These gases are methane, carbon dioxide, hydrogen sulphide et cetera. So this mixture of gas is non-ase biogas. And you know very well that biogas can be used as a renewable source of energy. It's 00:31:15 Can be used for lighting and cooking purposes. So the one thing to note here is that almost every microorganism produces gases in their metabolic pathway. But gasses can't escape. For example in the case of yeast when it undergrows anaerobic respiration which we call fermentation it produces the gas carbon dioxide and in the case of anaerobic bacteria which we are seeing in anaerobic sludge digester it decomposes the ah it decomposes the organic matter and it forms the biogas which is actually a mixture of methane carbon dioxide and hydrogen

00:31:56 Sulfide. So the effluent which is released after this process is known as the secondary effluent and this effluent is treated with disinfectant like chlorine before releasing into the reverse and stream. Now this effluent is safe enough to be discharged into the reverse. So this is the process which needs to be done in every industry because industries are the main polluters of the reverse. Here we can see the overview of a sewage treatment plant in the primary treatment. The Raw Sewage Which Is Collectively Coming From Various Households, Industries Extra. give

00:32:40 This is a screen through which the floating debris can be separated. The Large and Small Particles Which Are Floating Over It. This is a connector which is connecting it to the grid chamber. The Small Pebbles and Stones Will Get Settled Here. And then the further ah affluent will move into the raw and primary sludge. This primary sludge is being collected here. And the primary effluent the supernatant will move to the aeration tank for secondary treatment and biological treatment. In the Erection Tank Mechanical Agitation is Done and There's an Air Compressor to Pump Air Into It and Ah This

00:33:20 Iration tank the floc fashion will acer and once the BOD is reduced significantly it will be sant to ah for secondary clarifier where the activated sludge is being collected and the secondary effluent is treated with this before discharging into the river river bodies. So this activated sludge ah can be returned back to the aeration tank and the remaining part will move on for the anaerobic sludge digestion along with the primary sludge. So, this is the overview of a sewage treatment plant. i hope this overview of sewage treatment plant is clear enough

00:34:04 U. So, next moving on to the environmental concern. You must have heard about the two great rivers of India, Yamuna and Ganga. Both of them are very much polluted and many schemes and plans have been formulated to clean them. But all of these plans have resulted in less success. In this newspaper clipping you can see that ah Yamuna the Yamuna water is made dirty by many drains. Many of the drains that are present in Delhi are discharging their water into the Yamuna River and 70% of Yamuna pollution is contributed by Delhi. So this is a matter of grave


00:34:54 Concern to us. We are talking about sewage treatment plants. We know about the application of microbes but still we are not using this process effectively in order to keep our reverse clean. It is very essential for governments to formulate strict rules and regulations for their industries and drains and municipal corporations before discharging the dirty water into the river. Similar Here You Can See Ganga Soro Ganga Action Plan Nearly 40,000 Long Kilometers Drain Not Clean And The Ganga Is Said To Possess Many Fecal Cough Bacteria Official


00:35:38 Standard state 500 ml fecal coliform per 100 ml is safe for bathing in Varanasi but it is 120 times high. You can imagine the level of pollution in River Ganga. Specially in Varanasi ware many industries are there and they are discharging their waste water without treating it. Let Us Now Summarize What We Have Learned Today. Today we learned how much of the microbes can actually be beneficial for us. We know about many microorganisms earlier you have heard about the negative aspect of microbes. But Certain Microorganisms Are Binovative

00:36:21 And benign and they can be employed for our welfare. We learned about the common applications of microbes, their processes and products in household products. In Household Products We Learned About the Fashion of Curd. We learned about the fashion of fermented foods. We learned about the fashion of traditional drinks. Toddy about the fashion of different kind of things. Swiss cheese, Rockoff cheese all of them are utilising the microbes, their processes and products in one order form. Similarly in Industrial Applications Which Require Large Scale

00:36:59 Production We Learn That Large Vessels None As Fermenters Are Required And These Industrial Products Can Be Further Classified Into Three Major Types For The Production Of Fermented Beverages. These beverages can again be of different types on the basis of the substratum which is used and weather they are distilled or produced without distilled. Second, we learned about a very important discovery of the 20th century, which is of antibiotics and it has helped us in treating many deadly diseases. Antibiotics and chemicals


00:37:36 Substances produced by microbes that can kill and stop the growth of other disease causing microbes. This is a variant discovery that is of great importance to human health. Thirdly we learned about bioremediation. Bioremediation Means the use of organisms for cleaning pollution. And in bioremediation we saw how the sewage and the wastewater that is generated from houses and industries can be effectively treated by using microorganisms in sewage treatment plant. We Saw How Their Growth Can Be Enhanced Or


00:38:15 Facilitated in the sewage treatment plant by using aerator tanks which helps in the formation of floc. And these folks can consume the organic products and reduce BOD significantly. Once the BOD is reduced, the water can be safely used and discharged in the reverse. Now let's discuss some text book questions which are given in your NCERT book. First question Bacteria can't be seen with the naked eye but they can be seen with the help of a microscope. If you have to carry a sample v sample wud u take and

00:38:53 Why? Obviously the most common sample we can carry from our homes is curd and a small portion of curd carries millions of lactic acid bacteria in them. Second question. Give examples to prove that microbes release gases during metabolism. If you follow this chapter, I told you that microbes produce gases, release gases in their metabolic pathways. And V utilizes even this property of microbes in making our food items fluffy. For Example Dosa, Idli and Bhature's Extra. So This Is An Example Puffed Appearance Of Bread Dosedly


00:39:38 And the large holes in Swiss cheese are all due to the production of large amounts of carbon dioxide by propinobacterium Shermanii Third question in Whichever food you find Lactic acid bacteria and mention some of their uses. I think this is it. Lactic acid bacteria is found in curd and not only it increases its taste but also it increases its nutritional value by increasing vitamin B12 content. So, curd is recommended for good health. And what's it's ahhhhhhh

00:40:18 Increasing our health. Or it can be used for other purposes. And the use of lactic acid bacteria is that it converts the lactose into lactic acid by coagulating the milk and it increases the vitamin B12 content in it. Next Question Name Some Traditional Indian Foods Made of Wheat, Rice in Bengal Village Which Involve Use of Microbes. Again, this is a simple question. Dosa, idli. These are the examples of traditional Indian food items which are prepared by fermentation of wheat, rice and other items. Next question. In Whichever Way


00:40:56 Have microbes played a major role in controlling diseases caused by harmful bacteria. We Know That Microbes Produce Certain Chemical Substances Which Are Known As Antibiotics. These antibiotics as the name suggests are against the life but in the context of the disease causing microorganisms in the context of humans it is pro life and they have helped us in controlling many deadly diseases. Next question. Name any two species of fungi that are used in the production of antibiotics. One Example You Studied About the Penicillin Which Was the


00:41:36 First antibiotic to be discovered by Alexander Fleming. So, the two species of fungus, Penicillin, Notatum, Den Aspergillus, Fumigatus, Clavisaperporea. These are the examples of the fungal species that produce antibiotics and are successfully used in the health industry. Next question. What is seaweed? Can these be harmful to us? Sewage All the wastewater that is generated from the domestic household as well as from the industries. And Indeed It's Harmful to Us in Many Ways Because It Can Lead to the Growth of Many Diseases Causing

00:42:17 Microbes and it can lead to spread of water borne diseases. It reduces the dissolved oxygen content and it will kill the aquatic life due to the presence of large amount of organic matter in the sewage. And the last question is what is the key difference between primary and secondary sewage treatment. Ah we have delt this section in detail the sewage treatment plant. And you must be knowing the difference between primary and secondary. The primary treatment is the physical treatment of wastewater. It Involves Only the Separation of Large and

00:42:55 Small Particles, the Floating Debris Ware as the secondary sewage treatment is the main part which involves the use of microbes. And so it is all too familiar as biological treatment. With this Now I want you to reflect on some of the questions. I want you to think over the question. So that's in the next session we'll come back and discuss them. First question critically analyze the role of microorganisms in sustaining our ecosystem. So you have to think critically and holistically so that you get a broad view of the role of microorganisms

00:43:40 Watch them play in our ecosystem. And how each ecosystem and the survival of each ecosystem is dependent on the microbes. Second question What is the most distinguishing feature of microorganisms that enables them to be used for commercial production? What is property? What is that particular property of micro organism which enables us to use them for commercial level production. Third Question Find out from Magazines and Newspapers about any latest research on beneficial aspects of

00:44:19 microbes. If you read newspapers, scientific newspapers and journals, you will come across many true examples where microbes and their property as beneficial aspects are being researched and discovered. Next question. Can you suggest some examples in nature where microbes have proven to be beneficial. Apartment from Wherever We Have Studied Till Now. In nature all microbes do many activities which are of benefit to us. Please think over it and try to suggest some examples. and the last question that sum of the archaeobacteria r


00:44:58 Extremophiles. By Extremophiles. I mean that's microbes can live in extreme conditions. How are they able to survive in truly extreme conditions? With This I Would Like To End This Chapter. That's all about this session and in the next session we will continue with the further topics. Thanks you [Music]

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Overview

NEET Class 12 Biology NCERT Chapter 9 Microbes in Human Welfare

In this video, we will cover:

1. Microbes

2. Contribution of Microbes to Human Welfare

3. Microbes in Household Products

4. Microbes in Industrial Products

5. Microbes in Sewage Treatment

6. Sewage Treatment

7. Brilliant Tutorial Delhi NEET Biology

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Chapter 9 Microbes in Human Welfare Class 12 NEET Biology deals with:

Microbes are the major components of biological systems on this earth.

Microbes are present everywhere that is in soil, water, air, inside the body of plants and animals, inside thermal vents, deep in the soil, under the layers of snow several meters thick and in highly acidic environments.

Microbes are diverse such that they are protozoa, bacteria, fungi and microscopic plants viruses, viroids and prions that are proteinacious infectious agents.

Microbes like bacteria and many fungi can be grown on nutritive media to form colonies which can be seen with naked eyes.

Microbes cause a large number of diseases in human beings, animals and plants but all microbes are not harmful; several microbes are useful to man in diverse ways.

1. Production of curd

  • Milk is converted to curd by micro-organisms such as Lactobacillus and others commonly called lactic acid bacteria (LAB) which grow in milk and convert it to curd.
  • During growth of bacteria, the LAB produce acids that coagulate and partially digest the milk proteins.
  • A small amount of curd added to the fresh milk as inoculum or starter which at suitable temperatures multiply, thus converting milk to curd, which also improves its nutritional quality by increasing vitamin B12.
  • In our stomach, the LAB play very beneficial role in checking disease causing microbes.

2. Fermentation

  • The dough, which is used for making foods such as dosa and idli is also fermented by bacteria.
  • The puffed-up appearance of dough is due to the production of CO2
  • The dough, which is used for making bread, is fermented using baker’s yeast (Saccharomyces cerevisiae).
  • A number of traditional drinks and foods are also made by fermentation by the microbes.
  • Toddy, a traditional drink of some parts of southern India is made by fermenting sap from palms.
  • Microbes are also used to ferment fish, soya bean and bamboo shoots to make foods.

3. Production of cheese

  • Different varieties of cheese are known by their characteristic texture, flavor and taste, the specificity coming from the microbes used.
  • The large holes in ‘Swiss cheese’ are due to production of a large amount of CO2 by a bacterium named Propionibacterium sharmanii.
  • The ‘Roquefort cheese’ are ripened by growing a specific fungi on them, which gives them a particular flavor.

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