Microorganisms friend and foe class 8 Biology chapter under 30 mins

Summary

In this educational video, teacher Ankita delivers a crash course on microorganisms for Class 8 students, covering classification, benefits, and harmful effects. She explains the roles of bacteria, fungi, protozoa, algae, and viruses in food production, antibiotic discovery, and vaccines. Ankita also discusses environmental contributions, like decomposition and the nitrogen cycle, and addresses disease transmission modes. The video concludes with a call to action for students to test their knowledge through a linked quiz and to participate in a personality test for academic insights.

Takeaways

• 📚 The class covers the chapter on microorganisms from an 8th-grade biology curriculum.
• ⏰ The session is designed as a crash course, aiming to complete the chapter in under 20 minutes.
• 📝 Students are encouraged to take notes to remember important points for exams.
• 🌟 The chapter is divided into three main sections: classification of microbes, their beneficial uses, and harmful effects.
• 🔬 Microorganisms are classified into bacteria, fungi, protozoa, algae, and viruses, each with distinct characteristics and examples.
• 🍽️ Microbes play a crucial role in food production, such as in the making of curd, cheese, and alcoholic beverages.
• 💊 Antibiotics, like penicillin, are derived from fungi and are used to treat bacterial infections, but must be taken as prescribed to avoid resistance.
• 💉 Vaccines, first discovered by Edward Jenner, contain weakened or dead microorganisms to build immunity against diseases.
• 🌱 Microorganisms are essential in environmental processes like decomposition and the nitrogen cycle, aiding in nutrient recycling.
• 🚫 Microbes can also be harmful, causing diseases in humans, animals, and plants, with various modes of transmission.
• 🛡️ Food preservation methods, such as the use of chemicals, salt, sugar, and heat treatment, prevent spoilage caused by microorganisms.

Q & A

What is the main focus of the chapter 'Microorganisms' in the Class 8 curriculum?

The chapter 'Microorganisms' focuses on the classification of microbes, their beneficial uses, and their harmful effects.

How are microorganisms categorized in the chapter?

Microorganisms are categorized into bacteria, fungi, protozoa, algae, and viruses.

What is the significance of bacteria in the context of this chapter?

Bacteria are significant as they are present everywhere and play a crucial role in various processes, including food production and decomposition.

Can you provide an example of a fungus mentioned in the script?

Yeast and mushrooms are mentioned as common examples of fungi.

What is the role of microorganisms in food production?

Microorganisms like lactobacillus help in the formation of curd, and yeast plays a vital role in the production of alcoholic beverages, vinegar, and many other food products.

Who discovered the first antibiotic, and what was it?

The first antibiotic, penicillin, was discovered by Alexander Fleming in 1929.

How do vaccines work according to the script?

Vaccines work by introducing either dead or weakened microorganisms into the body, which stimulates the immune system to create memory cells that can fight off future infections.

What is the importance of the nitrogen cycle in relation to microorganisms?

Microorganisms play a crucial role in the nitrogen cycle by helping in the conversion of atmospheric nitrogen into forms that plants can absorb, and then returning it to the atmosphere after consumption.

What are the different modes of transmission of diseases caused by microorganisms?

The modes of transmission include airborne, waterborne, vector-borne, foodborne, and through surfaces or contact.

How can food preservation methods help prevent spoilage caused by microorganisms?

Food preservation methods such as adding chemicals, using salt, sugar, oil, vinegar, applying heat and cold, and vacuum sealing can inhibit the growth of microorganisms, thus preventing food spoilage.

What is the role of plasmodium in causing malaria as discussed in the script?

Plasmodium, a protozoan parasite, causes malaria. It is transmitted through the bite of a female Anopheles mosquito and multiplies within the liver and red blood cells of the host.

Outlines

00:00

📚 Introduction to Microorganisms

The video begins with a warm welcome from the teacher, Ankita, who introduces the topic of microorganisms for a class 8 audience. She emphasizes the importance of the chapter and announces a crash course designed to cover the entire syllabus in under 20 minutes. The class will cover classification, beneficial uses, and harmful effects of microorganisms. Ankita encourages students to take notes and subscribes to the channel for more educational content. The session promises to be comprehensive, including chapter summaries, mind maps, doubt solving, and mock tests.

05:00

🌱 Classification and Uses of Microbes

This segment delves into the classification of microorganisms, including bacteria, fungi, protozoa, algae, and viruses. The teacher provides examples for each category, such as lactobacillus for bacteria and yeast for fungi. The discussion then shifts to the beneficial uses of microbes, particularly in food production, where they contribute to the making of curd, cheese, alcoholic beverages, and vinegar. The discovery of antibiotics by Alexander Fleming and the role of penicillin in fighting bacterial infections are highlighted, along with the importance of following medical prescriptions to avoid antibiotic resistance.

10:02

💉 Vaccines and Environmental Impact

The teacher discusses the history and function of vaccines, which contain dead or weakened microorganisms to stimulate the immune system. Edward Jenner's discovery of vaccination and its importance in preventing diseases like hepatitis and measles are covered. The video also touches on how microorganisms play a crucial role in environmental processes such as decomposition and the nitrogen cycle, contributing to soil fertility and maintaining ecological balance.

15:02

🚫 Harmful Effects of Microbes and Disease Transmission

This part of the video addresses the harmful effects of microbes, focusing on the diseases they cause in humans, animals, and plants. The teacher explains various modes of disease transmission, including airborne, waterborne, vector-borne, foodborne, and surface transmission. Examples of communicable and non-communicable diseases are provided, along with specific diseases that affect animals and plants. The segment also covers the life cycle of the plasmodium parasite, which causes malaria, and its transmission through the female Anopheles mosquito.

20:04

🛡 Food Preservation and Conclusion

The final segment discusses methods of food preservation to prevent spoilage, including the use of chemicals, salt, sugar, oil, vinegar, heat treatment, and modified atmosphere packaging. The teacher then invites students to test their knowledge through a quiz linked in the video description and promotes a personality and career analysis test for students. The class concludes with a reminder to like, share, and subscribe for more educational content, emphasizing the importance of continuous learning.

Keywords

💡Microorganisms

Microorganisms are microscopic living organisms, which include bacteria, fungi, protozoa, algae, and viruses. They are the primary focus of the video, as they play a significant role in various aspects of life, from causing diseases to aiding in food production. The video discusses how these organisms can be both beneficial and harmful, emphasizing their importance in the ecosystem and to human health.

💡Classification of Microbes

The classification of microbes refers to the systematic categorization of microorganisms based on their characteristics such as shape, size, and other biological features. The video explains different types of bacteria (e.g., bacilli, cocci, vibrio, and comma shape) and other microorganisms like fungi (e.g., yeast, mushrooms), protozoa (e.g., amoeba, paramecium), algae (e.g., chlorella, kelp), and viruses. Understanding classification helps in studying their functions and interactions.

💡Beneficial Uses of Microbes

This concept in the video highlights the positive roles that microorganisms play in human life. For instance, certain bacteria like lactobacillus are used in food production to make curd and cheese, while yeast is essential for baking and brewing. The video also touches on how antibiotics, discovered from fungi like penicillin, are used to treat bacterial infections, emphasizing the need for proper usage to prevent antibiotic resistance.

💡Harmful Effects of Microbes

The harmful effects of microbes are discussed in the context of diseases they cause. The video mentions how microorganisms can lead to various illnesses in humans, animals, and plants. It also covers different modes of transmission, such as airborne, waterborne, vector-borne, and foodborne diseases, providing examples like the common cold, COVID-19, typhoid, and cholera. The video stresses the importance of understanding these harmful effects for disease prevention.

💡Antibiotics

Antibiotics are substances produced by certain microorganisms that can kill or inhibit the growth of other microorganisms, particularly bacteria. The video explains the discovery of the first antibiotic, penicillin, by Alexander Fleming, and how antibiotics are crucial in medicine for treating bacterial infections. It also warns against misuse, as overuse can lead to the development of antibiotic-resistant bacteria.

💡Vaccines

Vaccines are biological preparations that provide active acquired immunity to certain diseases. The video discusses how vaccines contain either dead or weakened microorganisms that, when introduced into the body, stimulate the immune system to recognize and fight off future infections. Edward Jenner's discovery of the smallpox vaccine in 1798 is mentioned as a historical milestone, and the video underscores the importance of vaccines in preventing diseases like measles and hepatitis.

💡Decomposition

Decomposition is the process by which organic matter is broken down into simpler forms of matter, such as carbon dioxide, water, and minerals. In the video, it is explained that microorganisms play a vital role in decomposition, helping to recycle nutrients back into the ecosystem. This process is crucial for maintaining soil fertility and is illustrated through an example of how vegetable peels decompose differently from plastic, which is not affected by microorganisms.

💡Nitrogen Cycle

The nitrogen cycle is the biogeochemical cycle by which nitrogen is converted into several forms usable by plants and animals. The video describes the various stages of the nitrogen cycle, including nitrogen fixation, nitrification, and denitrification, and how microorganisms facilitate these processes. This cycle is essential for life as it makes nitrogen available to plants and, indirectly, to animals and humans.

💡Food Preservation

Food preservation is the process of keeping food edible by slowing down the growth of microorganisms and enzymes that cause spoilage. The video lists various methods of preservation such as the use of chemicals, salting, sugaring, oil and vinegar, heating and cooling, and the use of spices. These methods extend the shelf life of food products and are demonstrated through examples like milk packaging and the making of pickles.

💡Vector-Borne Diseases

Vector-borne diseases are illnesses caused by pathogens transmitted by blood-feeding organisms, such as mosquitoes. The video specifically mentions malaria, caused by the Plasmodium parasite and transmitted by the female Anopheles mosquito. This keyword is crucial for understanding how diseases spread and the importance of controlling vector populations to prevent disease outbreaks.

Highlights

Introduction to the importance of microorganisms in Class 8 curriculum.

Overview of the crash course format for efficient learning.

Emphasis on the significance of microorganisms in various aspects of life.

Classification of microbes into bacteria, fungi, protozoa, algae, and viruses.

Explaining the different shapes of bacteria such as bacilli, cocci, and vibrio.

Benefits of microbes in food production, including the role of lactobacillus in curd formation.

The discovery of antibiotics, starting with penicillin by Alexander Fleming in 1929.

Importance of following doctor's prescriptions for antibiotic intake to prevent bacterial resistance.

Vaccines as a crucial tool in preventing diseases, discovered by Edward Jenner in 1798.

Mechanism of how vaccines work and their importance in building immunity.

Examples of common vaccines that protect against diseases like hepatitis and measles.

Role of microorganisms in environmental processes such as decomposition and the nitrogen cycle.

Discussion on the harmful effects of microbes, including diseases in humans, animals, and plants.

Explanation of different modes of disease transmission, including airborne, waterborne, vector-borne, and foodborne.

The concept of communicable and non-communicable diseases caused by microorganisms.

Examples of animal diseases like anthrax and foot and mouth disease, and plant diseases like citrus canker and rust of wheat.

Detailed explanation of how plasmodium causes malaria through the female anopheles mosquito.

Various methods of food preservation to prevent spoilage, including chemical, salting, sugaring, and heating.

Invitation to take a quiz to test knowledge on the chapter and information about the BYJU'S National colorful personality test.

Conclusion of the class with a reminder to like, share, and subscribe for more educational content.

Transcripts

hi everyone and welcome to sixth seventh

and eighth Channel by juice I'm your

teacher Ankita and I welcome you in

today's class where we will be

discussing about a very important

chapter from Class 8 and the name of the

chapter is microorganism and this is a

very important class because it's a

crash course class and most importantly

we will be discussing about this whole

chapter just under 20 minutes so I hope

that all of you are ready with your pen

and your notebook so that you know down

all the important points that we will be

discussing in today's class and if

you're new here please do take a moment

and hit that like button and subscribe

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channel we are making sure that you

Excel and Ace your examination so we

have launched the crash course in which

we will be completing your whole

syllabus we have chapter summaries under

20 minutes we'll be focusing on the

subjective and the objective questions

we have mind map doubt solving and so

much more and most importantly we will

be having by juice mock test so that

you're ready for your examination so

what are you waiting for hit the

Subscribe button and join our amazing

family and on that note let's get

started this is a very important chapter

from the exam point of view and when we

discuss about the microorganisms whether

they are friends or therefore we can

broadly categorize this chapter in under

the three important sub division it's

very important for us to break the

chapter so that we know what we have to

study and you know we can easily plan

our study so here we have first part

which is the classification of microbes

then we have beneficial uses of microbes

and then we have harmful effects of

microbes so we are starting with the

first one which is the classification

and here we go so in the classification

we will be discussing about the

different types of microorganisms we

have around us the first one of course

we have the bacteria now bacteria are of

course we say that they are everywhere

and bacterias are very very crucial for

all of us now in the bacteria present in

a different shape and different sizes we

have basili we have cocci we have vibrio

write the comma shape then we have this

parallel now of course these are the

different shapes of the bacteria the one

of the common ones I'm sure you all know

is the lactobacillus which is also a

bacteria so bacterias are there then of

course the next one that we'll be

discussing are the fungi now we're here

now for the common example in the fungi

is yeast and the mushrooms interesting

right then of course we have another

category which of the protozoa now here

we have amoeba and paramecium as the

examples then we have the algae where of

course we have the glidomonas and the

great kelp right and the last but not

the least which is virus now viruses are

not the living right they're not living

outside the human body but they're

living inside the host body of the human

body so the category of the virus is

still a kind of you know in between we

don't call them as living organisms all

together and we can't call them as

non-living also they are non-living

outside the body of the holes and they

are living inside the body of the host

and one of the common example of course

we discuss in the terms of the virus we

have the common cold right so these are

the few examples that you know we have

and common cold is a very common disease

caused by the virus right so uh these

are the different categories of the

microbes that we have we have bacteria

fungi protozoa algae and the virus now

that we're done with the first part of

it we'll be looking at the second part

of this particular chapter which deals

about the beneficial uses of the

microbes so microbes are really very

helpful to us and we'll be discussing

about how they help us in different

areas throughout our life

first of course we'll be discussing in

detail about the food production so we

have various microorganisms that

actually help in the food production and

of course in our daily products we have

already discussed about the lactose uh

lactose basili right of course this

actually helped me the formation of the

curd and we have other bacteria actually

help in the you know in the process of

making cheese then of course we have the

yummy yummy desserts that we have

definitely we have various

microorganisms playing a very important

role over here right then of course we

have the alcoholic beverages like wine

right there also we have the yeast and

other microorganism that plays a very

important role and of course we have the

vinegar so in all of these food and

different other products that we have

over here and different products that

that are available in the market

microorganisms plays a very important

role in the manufacturing of these so

they are actually very very helpful

moving ahead let's just discuss about

the another important category that is

of the antibiotics now antibiotics were

first discovered of course as we say by

Alexandra Fleming right in the 1929 and

what he did he actually discovered the

penicillin the first antibiotic now it

is a fungi so there's a story which goes

by that you know he was working and he

you know on a petri dish there was a

culture of the bacteria and after a few

days he saw that you know there's a

growth of something new on the petri

dish which is actually stopping the

growth of the bacteria from moving from

that particular place so then of course

uh he figured it out that it's a

penicillin and this is actually

antibiotic it means that it's stopping

the growth or it's restricting the

growth of the bacteria it's antibiotic

so we know that the first antibiotic was

Penicillin and of course now we have

different types of antibiotic that are

available in the market which of course

we consume right and and we take it only

when the doctor prescribed to us doctor

tells us to eat and there's a perfect

doses of we don't take over we don't uh

take the overdose because it will not be

helpful for the body now definitely it

is useful

if the doctor prescribers and of course

uh you know if you take a right amount

of doses which doctor have said us to

take now they will be helping in

fighting the bacteria which are there in

the body and will be helping in becoming

healthy again but just in case if you're

not following doctor instruction and if

we are consuming more of it what will

happen it will be harming our body apart

from that the bacterias will become

resistance right so one tablet can kill

a certain amount of bacteria if we keep

on taking that one tablet maybe the

bacteria will feel you know what we can

have the resistance and maybe we have to

increase the doses to fight those

bacteria so they become resistance

towards that particular antibiotics so

we have to make sure that we are not

taking them in a large quantity we

should be taking them as in terms of the

doctor prescriptions only so this is

really very important point so this is a

very important two marks question or a

three marks question that can come apart

from that the previous topic which we

have with food production is equally

important so please make sure to note

all the important points there also so

we have discussed about the food

production antibiotics now let's discuss

about a very very important topic which

which usually come here in your

examination that is of the vaccine so

let's understand how we have the

vaccines so the vaccine was first

discovered by the Edward Jenner right in

the year 1798 and of course from there

only we have the vaccination so in the

vaccination what we have it's nothing

but a fluid right a serum uh liquid

which contain either the dead

microorganisms or the weakened

microorganisms that will be getting

injected into the individual right and

as I get into the individual's body it

will have a difference mechanism so as

it enters the body of the individuals

the white blood cells in the human body

will start fighting it as it is dead or

the weak right it will not be having

that harmful effect on the body of the

individual the individual men might have

some reactions to it right maybe a fever

write another few symptoms will be there

but what will happen the bodies will be

identifying it and there will be the

creation of memory cell that goes into a

mind next time when a live pathogen

enters in the body of the individual

they can easily fight so that's why

vaccination becomes really very

important and there are two modes of

taking these vaccines or basically these

uh all the microbes in the body that

will be helping us to have our immunity

first of course by the injection

directly injecting the injections or by

the oral vaccine but both of these

methods what is happening we are taking

a small amount of the dead or the weak

microbes or microorganisms in our body

our body will be creating a defense

mechanism and there will be a cells that

will stay in our body next time if these

microorganisms living micro organisms

attacks a body we have a defense

mechanism already intact within our body

and they will be helping fighting the

living organism that's how how body

immune system works so this is really

important can be asked in the

examination how the vaccines works and

why they're important three marks

question please take a note of it now

let's discuss about the different types

of vaccines we have right and uh the

diseases that provide the protection

against so we have two book losses

right

um we have cholera of course hepatitis

and measles so I'm sure when you were

younger I'm sure you would have taken

the vaccines for the hepatitis and the

measles right and so in the future just

in case if we uh you know if we

encounter them again our body will not

have that adverse effect this is really

very important so till now we have

discussed about the beneficial uses of

microbes that are definitely definitely

very benef beneficial for all of us the

help in the food production right we

they help in the food production in the

antibiotics vaccine now let's discuss

about the environment now environments

right it's science it sounds very

different let's see how the

microorganisms are helping so first of

all they actually help in the process of

decomposition they actually help in

cleaning out right the dead and Decay

matter so decomposition becomes really

very important in our environment and

this is very very important for all of

us the composition actually help in

clearing out the dead materials right

and over here we have an activity that

will be helping us to understand the

decomposition so in one jar of course in

one uh jar we have the living uh we have

the living material basically we have uh

the waste of the plants right vegetable

Peels and on the on the beaker B we have

the plastic eventually we know that

microorganisms would be able to only act

on this right this material the

vegetables the vegetable peels the fruit

peels the leaves right or the dead

organisms and we will see getting

decomposed right whereas the plastic of

course will remain unaffected by the

microorganisms so this is really very

important actually help in clearing out

our environment apart from that it

actually adds a lot of nutrition back to

the soil so decomposition becomes really

very important and we have the

microorganisms to thank for

then microorganisms help in a very very

important process which is the nitrogen

cycle now nitrogen cycle is really

interesting and super important from the

exam point of view also so we know that

we all need nitrogen and nitrogen is

there in our atmosphere on a huge amount

but still we cannot take the nitrogen

directly nor us not plants not any

living organism but nitrogen is really

very important so how we are getting the

nitrogen let's understand that so we

have the atmospheric nitrogen the plants

cannot directly take it right of course

they will be taking away the help of

course of the various microorganisms and

of course there are very different steps

all together so the atmospheric nitrogen

right of course we'll see the fixation

of the nitrogen it will be moving into

the soil of course we have the bacterias

over there that will be helping in

breakdown of it to the ammonium then of

course the nitrate and nitrate and

further they're only to be getting

absorbed by the plants and hence they

have the nitrogen and if we consume

plants or any other animals consume

plants they'll get the nitrogen and of

course the remaining will be going back

into the atmosphere so here we have the

two important steps we have the

atmospheric nitrogen then we'll see the

nitrogen fixation a modification right

then we have nitrification and at the

end we had the denitrification so it's a

very important concept please make sure

you take a note of it and please make

sure you read from your textbook that uh

you know what are the steps and how you

have to write in your examination it's

very very important so please make sure

you are starting it separately on that

note let's move ahead right so we have

discussed as of now about the

classification of microbes and we have

discussed about the beneficial uses of

microbes now we are left with one of the

last topic which is the harmful effects

of microbes and let's discuss about that

so we know that microorganisms causes

various diseases and when we talk about

the diseases we will be discussing about

the human disease first and then of

course the New Zealand plants and the

animal

and human diseases let's discuss about

what are the modes of transmission so

there are different modes of

transmission that we have

in terms of the medium that the

microorganism using from from moving

from the infected individual to the

healthy individual so of course we have

the airborne disease right Airborne in

the air so if a person who was carrying

a virus right if the sneeze or the cuff

the droplets will be carrying that

particular

virus in the air and if we have

unhealthy individual into that

surrounding if the inhaler if they get

you know if they get this droplet on

their body and of course it gets inside

their body they might get the disease so

the air is a very important medium then

of course the water so various

microorganisms use water as a medium of

the transportation right then we have

the vector now in this particular case

these Vector will be carrying the

particle pathogen right from one

individual from the affected individual

to the healthy individual when we have

the foodborne disease of course where

the food if there is a contamination of

the food right for example we have this

fly right if uh the fly sits fly sits on

a various you know waste material and

the features right and if it comes from

there and it collects the various

pathogens and if that particle sits on

up food and if we consume that food yes

the healthy person might get infected so

these are the different modes and the

last one is from the surface right for

might Bond of course from the surfaces

that we have all around us like if

there's infected individual who's

touching the surface I never held into

individual touches that there are

chances that you know we can transfer

the disease in terms of the clothes also

it can easily move from the infected

individual to the healthy individual so

we hear what we have is a different mode

of transmission now we'll be discussing

in details of the types of diseases we

have so we have the communicable

diseases and non-communicable disease as

the world is there communicable diseases

these move from one individual from the

infected individual to the of course to

the healthy individual so we have

Airborne diseasement examples we have

common cold kovid in waterborne with

disease we have typhoid and cholera

Vector bone diseasement we have malaria

and Dengue so the agent the vectors over

here is the mosquito but inside that

mosquito we have the pathogens that will

be causing the malaria and the Dengue

then we have the formite bond we have

the chickenpox and the influenza then of

course we have the non-communicable

diseases like you know

um asthma and all of these other

diseases like heart attack any issues

with the heart so these diseases are

over here so we are clear with the

different types of diseases and of

course we have the examples now examples

are really very important so please make

sure you remember the examples each of

these you should remember to do examples

because it can come in your examination

and it'll be helping you to score good

mass in your examination also so we're

done with this political topic where we

have discussed about the types of

diseases and we have discussed about the

human diseases now we'll be moving ahead

to the animal and the plant diseases so

here we go

we'll discuss about the animal first so

in animals they they also get infected

by the various pathogens and pathogens

are the organism that causes disease so

here we have the anthrax and of course

we have the foot and mouth disease in

the animals and in Plants we have

various diseases like we have the Citrus

cancer in Citrus of course in lemon

trees we have rust of wheat in wheat and

we have the yellow veins Massac of bindi

so these are the plant diseases that are

caused by the various microorganisms now

we are clear with the animal disease and

the plant disease and now we'll be

taking a look at the plasmodia sorry

plasmodium right and how it causes the

malaria so we know that malaria is

caused by the plasmodium which is a

protozo one right and uh the vector over

here is a female anopheles mosquito so

this particle mosquito right when bites

a healthy individual if it's carrying

the plasmodium it will be releasing the

plasma modium in the body of the healthy

individual right they will be going

first into the liver cells right and of

course from there they'll be moving to

the red blood cells so this becomes a

really uh very uh evident example of the

vector born diseases plasmodium over

here is a pathogen and the vector which

is carrying the plasmodium is the female

anaphylase mosquitoes River do remember

these examples moving ahead right we

have this uh interesting information for

all of us to remember over here we have

the Citrus chemical disease Citrus

plants it's a bacterial disease do

remember this also then of course we

have the yellow Maasai Queen lady finger

in Plants will be able to see this and

it is caused by a virus disease it's a

viral disease and then we have the rust

of wheat it we'll see in the wheat and

it is a fungal disease so we have

discussed about the different types of

diseases altogether now we'll be

discussing about that how we can

actually

prevent right and prevent uh actually

preserve the food so if you if you keep

the food outside for some time you will

see that it'll become spoiled right but

on a daily basis we use various food

products that have been preserved

properly so that we can use we'll

discuss about that right there are

various methods for the food

preservation so first of course we have

the chemicals we add the chemicals so

that the shelf life of the products

increases and will be able to use them

after a long time then of course we have

the use of common salt if we add the

salt of course we'll see the loss of

water and of course as there's a lot of

water we will able to see that you know

me especially in the terms of meat it

will be easily preserved then of course

we use sugar as a method of preservation

especially in jams right especially in

Jellies all together then of course we

have the oil and vinegar I'm sure you

would have seen your you know in your

family the making of the pickles and

definitely they add the lot of oil and

vinegar to make sure that the food the

food products are not getting spoiled

and they're preserved for ears together

then we have the heat and cold this of

course we see in the milk right the milk

package as we get so there will be the

heating of the milk and then of course

there'll be a certain cooling of the

milk and the liptagonal Tetra pack so

that they can come to us and we can

easily consume them then the last one of

course is the heat and cold of course

adding the spices all together so we're

here right we have it and of course

there's a we use the eight at containers

right we make sure there's no air inside

it so that actually adds on to a lot so

we have discussed about the methods of

the food preservation and this

particular topic we are done with this

interesting and super important chapter

I hope that all of you have taken note

of all the important points that we have

discussed we will be meeting really very

soon but before I go let me quickly tell

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free and after the stress you will be

able to see an amazing report 15 page

academic report that will be helping you

to understand about your skill set your

behavior your subject and your career

analysis so please make sure to register

for this and on that note I will end the

class I hope that you've enjoyed the

class and I hope that all of you have

taken a note of all the important points

that we have discussed we'll be meeting

in the next class till that time please

make sure to hit the like button for the

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subscribe it's amazing Channel we'll be

meeting really very soon till that time

take care of yourself and keep on

learning with byju's

God