NCERT Solutions for Class 8 Science Chapter 2
Important NCERT Questions
8th Chapter 2 Microorganisms: Friend and Foe
NCERT Books for Session 2022-2023
CBSE Board and State Bord
Questions No: 8
Write a short paragraph on the harms caused by microorganisms.
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Microorganisms are harmful in many ways. Some of the microorganisms cause diseases in human beings, plants and animals. Such disease-causing microorganisms are called pathogens. Some microorganisms spoil food, clothing and leather. Some of the common diseases affecting humans are cholera, common cold, chicken pox and tuberculosis. Several microorganisms not only cause diseases in humans but also in animals. For example, anthrax is a dangerous human and cattle disease caused by a bacterium. Disease causing microorganisms in plants like wheat, rice, potato, sugarcane, orange, apple and others reduce the yield of crops.
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Microorganisms can be friend as well as for.Bad microorganisms or harmful microorganisms caus illness and spoils food, leather.clothes,etc.
•Cholera, jaundice,Ring worm etc are some of the disease caused by micro-organisms
•Microorganisms that cause illness are called pathogens.Some microbes in food can produce toxins and if such food is ingerted,it can cause food poisoning.Example -Botulism.