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write note on harmful effects organism

Answer 1

the organism are very harmful for us because by these organiser we are suffering from very diseases and the disease caused by virus is known as pathogen

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Nipun commented 4 year(s) ago

what are the harmful effects of microorganisms and the advantages of microorganisms?

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Class-VIII Biology

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Asked by Nipun

Oct 25

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Surya rao , Student

Member since Jun 25 2013

Microorganisms are small organisms invisible to the naked eye because of their extremely small size.  They are grouped into various groups like Bacteria, fungi, algae, protozoa and viruses.
Many of these organisms are useful to human and nature while some are harmful and even cause diseases.

TypeUseful microorganisms (one example)Harmful microorganisms(One example)
BacteriaLactobacillus (curd bacteria)Salmonella typhi (causes typhoid)FungiPenicillium notatum (to make antibiotics)Trichophyton rubrum (Athlete's foot)AlgaeAnabaena (biological nitrogen fixation)Blue-green algae and red tides (produce toxins)ProtozoaParamecium (kills harmful bacteria)Plasmodium (malaria fever)Viruspolio, chicken pox (to make vaccines)HIV (causes AIDS) 
Useful effects of microorganismsBacteria: In industries, they are needed to make curd, cheese, vinegar, lactic acid, alcohol and even in ripening of tea leaves, etc.Fungi: Some useful fungi are yeast, used to make dough in bakery and alcohol etc. Some fungi are useful for preparing antibiotics. Some mushrooms which are useful in making vitamins and organic acids.Algae: Some useful algae are chlorella (produce protein and vitamin), red algae (agar) and brown algae (Iodine and potassium).Protozoa: Some help in the final degradation of waste and sewage while some are symbiotic in nature.Virus: They are used for scientific research such as in biotechnology, genetic engineering, gene therapy and for making antibiotics etc. 
Harmful effects of microorganisms:Bacteria: Causes various diseases such as typhoid, diarrhea, and cholera.Fungi: Causes a large number of diseases in plants and in animals such as rust diseases in plants, fruit rot in apple, red rot in sugar cane and ring worm disease in human beings.Algae: Algal boom in water (rapid growth of algae) causes poisonous effect after they die, which in turn results in the death of aquatic organisms.Protozoa: Causes Amoebic dysentery, pyorrhoea and sleeping sickness etc.Virus: Cause small fox, common cold, influenza, herpes, hepatitis, polio and rabies