Different diseases caused by different microorganisms are

Microorganisms Name

Disease Caused


Cholera,Typhoid,TB (Tuberculosis)


Ringworm and Athlete's food 






Polio ,Chicken Pox, Hepatitis,Aids





Some diseases are spread from an infected person to a healthy person. They can be spread through air, water, food, physical contact

Such diseases are called communicable diseases

Example - Cholera, Cold, Chicken pox



How do Pathogens cause communicable disease?

When a person suffering from cold sneezes,drops of moisture  are spread in air. These drops contain thousands of virus,

When it reaches healthy person,he gets infected

These can also be spread by

  • Physical contact(Touching an inected person)
  • Water(Drinking water from Same Utensil)
  • Food(Eating food from same utensil)



What are carriers of Disease causing microbes?

Some insects and animals carry harmful microorganisms (pathogens) on them



They sit on garbage and waste

Harmful micro organsims called pathogens stick to their body

When they later sit on food,they drop these pathogens on food

When person eats this food,pathogens enter body and cause diseases




Mosquito’s cause diseases like malaria or dengue.

Female Aedes mosquito acts as carrier of dengue virus

Female Anopheles mosquito acts as carrier of malaria parasite(plasmodium)

When they bite human being,they transfer this virus/parasite in human being causing disease





How to Prevent Different Diseases caused by Microorganisms






It is caused by Protozoa

It is transmitted by Mosquito

  • Use Mosquito spray
  • Do not allow water to collect so that mosquitos do not breed
  • Use mosquito net when sleeping
  • Keep surroundings clean and dry


It is caused by Virus.
It is transmitted by Mosquito

Hepatitis A

Hepatitis B

They are caused by Virus

They are transmitted by Water

Drink Boiled Water (boiling kills microorganisms)

Vaccination should be done

Cholera and Typhoid

They are caused by bacteria

Typhoid is transmitted by water

Cholera is transmitted by both food and water

Maintain good personal hygiene

Boil water

Eat properly cooked food


They are caused by bacteria.
Transmitted by air

It is a communicable disease

So keep patient in isolation

Keep belongings of patient separate

Vaccines should also be given


They are caused by virus.
Transmitted by air

Chicken Pox

They are caused by virus.
Transmitted by air or by contact


They are caused by virus
Transmitted by air or by water



NCERT Question 1 (d) - Cholera is caused by __________.

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NCERT Question 2 (d) - Tick the correct answer:

The most common carrier of communicable diseases is

(i) ant (ii) housefly (iii) dragonfly (iv) spider

View Answer


NCERT Question 3 - Match the organisms in Column I with their action in Column II

Column II

Column II

(i) Bacteria

(a) Fixing Nitrogen

(ii) Rhizobium

(b) Setting of curd

(iii) Lactobacillus

(c) Baking of bread

(iv) Yeast

(d) Causing Malaria

(v) A protozoan

(e) Causing Cholera

(vi) A Virus

(f) Causing AIDS


(g) Producing antibodies

View Answer


NCERT Question 8 - Write a short paragraph on the harms caused by microorganisms

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NCERT Question 5 - What are the major groups of microorganisms?

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NCERT Question 2 (c) - Tick the correct answer:

Carrier of malaria-causing protozoan is

(i) female Anopheles mosquito (ii) cockroach

(iii) housefly (iv) butterfly

View Answer

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Maninder Singh

CA Maninder Singh is a Chartered Accountant for the past 14 years and a teacher from the past 18 years. He teaches Science, Economics, Accounting and English at Teachoo