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Oct 4, 2019 · Microorganisms are harmful to us in many ways. For example, microorganisms, called pathogens cause disease in humans, plants and animals. Pathogens or germs enter a healthy body through air, water, contaminated food and infected person by direct or indirect contact or by the carrier.
- Microorganisms: Friend and Foe Class 8 Notes Science Chapter 2
Here we have given NCERT Class 8 Science Notes Chapter 2...
- Microorganisms: Friend and Foe Class 8 Notes Science Chapter 2
- They Love Death – Fungi
- Creepy Protozoans
- Viruses – from Computers to Life
- Save Yourself – Vaccines and Antibiotics
- Watch What You Eat! – Food Poisoning and Preservation
Fungi
1. Fungi are saprophytic or parasitic organisms. 2. They are mostly multicellular and not microscopic. 3. However, yeast is a unicellular and microscopic organism. To know more about Fungi, visit here.
Fermentation
1. Fermentation is a metabolic process that converts sugar to acids, gases or alcohol. 2. Fermentation is used in the preparation of curd and alcohol.
Protozoa
1. Protozoa are single-celled microscopic animals which include flagellates, ciliates, sporozoans and many other forms. 2. A few examples of protozoa are amoeba, paramecium, euglena, plasmodium, etc. To know more about Protozoa, visit here.
Viruses
1. Viruses are organisms that possess nucleic acid but lack replicating machinery. 2. Thus, a virus cannot survive without a living cell. 3. Viruses are also considered to be on the borderline between living and nonliving entities. 4. A few examples of viruses are influenza virus, HIV, Rabies virus, poliovirus, tobacco mosaic virus, etc. To know more about Viruses, visit here.
Vaccines
1. Vaccines are usually made for viral diseases. 2. A few examples of vaccines are Salk vaccine for Polio, Influenza vaccine, Rabies vaccine, etc. To know more about Vaccines, visit here.
Antibiotics
1. Antibiotics usually target bacteria. 2. Thus, most bacterial diseases are treated with antibiotics.
Pathogens
1. A pathogen is any organism that causes disease. 2. In this context, pathogens are microorganisms. 3. Bacteria, protozoa and viruses can be pathogenic. To know more about Pathogens, visit here.
Food poisoning
1. When food contaminated with pathogens or toxins is consumed, it causes food poisoning. 2. The most common symptom is a pain in the stomach. 3. In severe cases, food poisoning can also cause death.
Food preservation
1. Food preservation is the most vital part of the food industry. 2. Certain chemicals inhibit the growth of bacteria and increase the life of the cooked food. 3. Certain simple preservation methods can be carried out at our home. To know more about Food Poisoning and Food Preservation, visit here.
Chemical methods
1. Chemical preservatives are used in food preservation by major food industries as they are harmless to humans. 2. Sodium meta-bisulphate and sodium benzoate are commonly used chemical preservatives.
Class 8 Science Chapter 2 Microorganisms Friend and Foe Notes by Vednatu will explore the fascinating world of microorganisms, which are tiny living things that are all around us. This chapter is an essential part of the CBSE Class 8 Science Syllabus and provides a detailed look at how these microorganisms can be both helpful and harmful.
- As per Class 8th Science Chapter 2 notes, microbes are used to make food products, prepare new medicines, and different bioactive molecules at a ve...
- Pathogens are microorganisms that cause diseases in a host. They are generally parasites. Follow the notes of Science Class 8 Chapter 2 to find exa...
- A carrier is someone who is carrying pathogens and contaminating others. A vector is a carrier of diseases that contaminates a disease by biting a...
- Microorganisms, often known as microbes, are living organisms that are invisible to the naked eye. They are only visible using a magnifying glass o...
- Microorganisms may exist in a variety of conditions. Some, such as algae, can be found in water. The air contains bacteria and viruses, many of whi...
- Microorganisms can be both a friend and an adversary, according to Chapter 2 of Science Class 8. Several microorganisms are utilised in cooking, co...
- Microorganisms are unicellular or multicellular organisms that cannot be seen by the naked eye. They are categorized into six major types as per th...
- The nitrogen cycle is the conversion of nitrogen in the environment into chemical forms. Plants require nitrogen to flourish, but they cannot take...
Aug 12, 2024 · Here we have given NCERT Class 8 Science Notes Chapter 2 Microorganisms: Friend and Foe. CBSE Class 8 Science Notes Chapter 2 Microorganisms: Friend and Foe. Microorganisms are too small and are not visible with the naked eye. They can live in all kinds of environment, ranging from ice cold climate to hot springs, deserts and marshy lands.
Jul 21, 2023 · in this video we are studying class 8 science chapter 2 microorganisms friend and foe, in this video we are completely covering this chapter with ncert line ...
- 95 min
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- NCERT TUTORIAL 6,7 and 8
Oct 5, 2017 · Study Material and Notes of Ch 2 Microorganisms: Friend and Foe Class 8th Science. Topics in the Chapter. • Introduction. • Microorganisms. • Classifications of microorganisms. • Food Preservation. • Methods of food preservation. → Chemical methods. → Heat and cold Treatments. → Storage and Packing. • Importance of microorganisms.
According to NCERT Solutions for Class 8 Science Chapter 2, microorganisms cause diseases in plants and animals. For example, Cholera in humans is caused by bacteria called Vibrio cholera. In animals, the virus causes foot and mouth diseases.
