Microorganisms Friend and Foe Class 8 Science Chapter 2 Notes

Class 8 Science Chapter 2 Microorganisms Friend and Foe Notes for Quick Memorise of Chapters. Science Class 8 Chapter 2 Gives us Knowledge about Microorganisms and its uses in day to day life.

Microorganisms : Friend and Foe Class 8 Science Chapter 2 Notes

Microorganisms: These Organisms are Very Small in Size and we Can’t See them with Naked Eyes.

Microorganisms Type: These Microorganisms are Classified into four Major Group. These are Bacteria, Fungi, Protozoa, and Algae.

Virus: These are also a Kind of microorganisms. These Microorganisms are Depends on Living Being For Their Life. If Virus Goes Outside of Body then it Died. The virus is Like a Foe / Enemy for Human Body and Other Living beings. Virus Cause Cough, Common Cold, Influenza.

Bacteria: Bacteria is Very Useful for us. It Behaves Like a Friend. Bacteria increase Soli Fertility and It Mainly used in the Preparation of Medicines which is Eaten by Us.

Making of Curd and Bread: Curd Contains many Kind of Microorganisms Which are Beneficial for us. These Microorganisms are Bacterium, Lactobacillus and Yeast are Some Microorganisms Form Them. Bread Contains Yeast Microorganism.

Fermentation: Conversion of Sugar into Alcohol by Yeast is Called Fermentation.

Antibiotics: These Organisms Stops the Growth of Harmful Microorganisms and Finish Them. Such Kind of Medicines is Known as Antibiotics.

Vaccine: Our Body has Their Antibodies which fight from Disease and Try to Keep Safe Us.

Benefits of Microorganisms: Microorganisms Increase Soil Fertility, Clean our Environment, Protect Our Body and Much More…

Communicable Disease: Microbial Disease which can Spread From infected Person to Healthy Person is Known as Communicable Disease. Some Insects and Animals act as a Carrier for This Disease. Examples: Mosquito cause Malaria

Diseases Caused By Virus: Measles, Chicken Pox, Polio, Hepatitis A

Diseases Caused By Bacteria: Tuberculosis, Cholera, Typhoid.

Plant Diseases: Citrus Caused by Bacteria Through Air, Rust of Wheat Caused by Fungi through air and Seeds, Yellow Vein Mosaic of Bhindi Caused by Virus Through Insects.

Methods for Protect of Food from Microorganisms: Chemical Method ( Here Chemical are Used ), Preservation by Common Salt ( Here Salt is Mixed into Food ), Preservation By Sugar ( Sugar Reduces Moisture and Growth of Bacteria ), Preservation by Oil and Vinegar, Heat and Cold Treatment.

Pasteurisation:  During This Process, Food is Heated at 70° C for 30 Seconds and Chilled Suddenly. By Doing This Most of Microorganisms Died.

Nitrogen Cycle: Our Atmosphere Contains 78% Nitrogen. Nitrogen is the Food of Plants. It Helps in The Growth of Plants. The nitrogen cycle is the biogeochemical cycle by which nitrogen is converted into multiple chemical forms as it circulates among the atmosphere, terrestrial, and marine ecosystems. The conversion of nitrogen can be carried out through both biological and physical processes.

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