Extra Questions for Why do we fall ill

Given below are the Class 9 Science Extra Questions for Why do we fall ill
a. Fill in the blanks
b. Multiple choice questions
c. Very Short answer questions
d. Short answer questions
e. Long answer questions

Fill in the blanks

Question 1.
Fill in the blanks
(a) ____ disease continues for many days and causes _____on body.
(b) _____disease continues for a few days and causes no longer term effect on body.
(c) ______is defined as physical, mental and social well-being and comfort.
(d) Common cold is _____disease.
(e) Many skin diseases are caused by _____.


(a) Chronic, long term effect
(b) Acute
(c) Health
(d) Infectious/ communicable
(e) Fungi

Multiple choice questions

Question 2.
You are aware of Polio Eradication Programme in your city. Children are vaccinated because
(a) vaccination kills the polio causing micro-organisms
(b) prevents the entry of polio causing organism
(c) it creates immunity in the body
(d) all the above

Question 3.
Viruses, which cause hepatitis, are transmitted through
(a) air
(b) water
(c) food
(d) personal contact

Question 4.
Vectors can be defined as
(a) animals carry the infecting agents from sick person to another healthy person
(b) micro-organisms which cause many diseases
(c) infected person
(d) diseased plants

Question 5.
Which disease is not transmitted by mosquitoes?
(a) Dengue
(b) Malaria
(c) Brain fever or encephalitis
(d) Pneumonia


2. (c)
3. (b)
4. (a)
5. (d)

Very Short Answer type

Question 6.
Name the causative agent for (i) Typhoid and (ii) Malaria?


Salmonella typhi.

Question 7.
Name the system which is responsible for fighting on incoming pathogen?


immune system

Question 8.
Write the causative agents of following:
c.Sleeping sickness


(b) staphylococci
(c) staphylococci
(d) Rhabdovirus
(e) poliomyelitis

Question 9.
Name any two diseases which are caused due to unprotected sexual intercourse?


HIV/AIDS and Syphilis

Question 10.
Which disease cause more effects on general health- acute or chronic?


Chronic disease is more harmful than acute because acute diseases last for very short period of time but chronic diseases is long term illness i.e the disease that last for a long time, even as much as a lifetime

Question 11.
Many vaccines form the public health programme of childhood immunization for preventing infectious disease. Name any two such diseases?


(i)Vaccine against measles.
(ii) BCG vaccine against T.B.

Question 12.
What type of disease can be prevented through vaccination?


Chickenpox, Measles, Influenza

Concepts questions/Short answer questions

Question 13.
State two principles of treatment of a disease?
Question 14.
Write three precautions you can take in your school to reduce the incidence of infectious diseases?


(a) Staying away from infected person
(b) covering mounth while sneezing and coughing
(c) keeping the environment clean and drinking clean water

Question 15.
Differentiate between congenital disease and acquired disease?


Extra Questions for Why do we fall ill for Class 9 Science

Question 16.
“When we think about health, we think about community but when we think about disease, we think about individual sufferer”. Do you agree? Comment with two example?
Question 17.
Why social harmony and good economic conditions are necessary for good health?
Question 18.
An active immune system forms many cells to the affected tissue to kill off the disease causing microbes. Identify the process and mention its local and general effects?
Question 19.
What are the different means by which infectious diseases are spread?


Disease can be spread from infected person to healthy person by means of water, air, food, insect, physical contact

Question 20.
Common cold spread faster and is difficult to control. Give reason?


Common cold is a communicable and air borne disease, i.e., the microbes spread through the air.
Thus, common cold spreads faster and is difficult to control.

Question 21.
You have suffered from chicken pox, when you were in class three. Why will you not suffer from it again?


Once you have chicken pox,your body develops antibodies against it and these prevent from happening that again in future

Question 22.
'Educating parents would help a lot in reducing the incidences of disease in children'. Justify the statements with reasons?


(i) They will provide us contaminated free water and food
(ii) our parents will have knowledge about diseases and their symptoms so they will come to know that their child is having any symptom of any disease and they can save their child.

Question 23.
What is immunization?


Immunization is a specific method of preventing diseases by inoculating vaccines in the human body.

Question 24.
Why villagers suffer with cholera more than urban people?


cholera is transmitted through food and water. In rural areas
(i) people often defecate in open and then flies sit on that and speard cholera
(ii) Water is often contaminated and villager do not have purifier

Question 25.
(i)What causes Japanese encephalitis? (ii) How it can be prevented?


(i) Japanese encephalitis is caused by virus which enters into human body through mosquito bite.
(ii) By keeping the surrounding clean and taking proper measures against mosquito bite, it can be prevented.

Question 26.
Tabulate three differences between acute and chronic diseases?


 Why do we fall ill  Class 9 Extra Questions

Question 27.
What are the various ways to prevent the disease?
Question 28.
“Antibiotics are not effective for viral diseases”. Justify this statement?

Long Answer type

Question 29.
Give the ways by which microbial agents can commonly move from an infected person to someone else for the following disease:
c.Common cold
e.Fungal infection
Question 30.
Health is not merely absence of diseases. How can we define health? Classify diseases on the basis of:
(a)Duration of the diseases.
(b)Cause of the diseases.
Question 31.
A doctor/nurse/health-worker is exposed to more sick people than others in the community. Find out how she/he avoids getting sick herself/himself?
Question 32.
Mention any five common preventive measures against infectious diseases?
Question 33.
In a slum area, many people are suffering from malaria. Mention any four unhygienic conditions that must be prevailing in that locality?
Question 34.
(i)What is AIDS? (ii)What are the common methods of transmission of AIDS? (iii)AIDS patient should not be demeaned in the society. State reason?


This Class 9 Science Extra Questions for Why do we fall ill with answers is prepared keeping in mind the latest syllabus of CBSE . This has been designed in a way to improve the academic performance of the students. If you find mistakes , please do provide the feedback on the mail.

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