Why Do We Fall Ill?


What do you mean by immunity?


The ability of the body to be resistant towards injury, poison or harmful pathogens and their products is called immunity. It is part of the defence reaction in the body. There are two types of immunity:

  • Natural or Innate immunity.
  • Acquired or Specific immunity


Why Do We Fall Ill?

Q 1.

Under which of the following conditions are you most likely to fall sick ?
(a) when you are taking examinations.
(b) when you have travelled by bus and train for two days.
(c) when your friend is suffering from measles. Why ?

Q 2.

Why are antibiotics not effective for viral disease ?

Q 3.

What are the immunisation programmes available at the nearest health centre in your locality? Which of these diseases are the major health problems in your area ?

Q 4.

What is immunisation?

Q 5.

What are acquired diseases?

Q 6.

Are the answers to the above questions (Q2 and Q5) and necessarily the same or different? Why?

Q 7.

Give four examples of Chronic diseases.

Q 8.

Give three examples of bacterial diseases.

Q 9.

Give examples of fungal diseases.

Q 10.

How do antibiotics (say Penicillin) work on bacteria but not on human beings?

Q 11.

Define antibiotic? Explain how it is able to control bacterial infections but not viral infections.

Q 12.

Name the vector which causes malaria.

Q 13.

Name the diseases that can spread through housefly.

Q 14.

Give the modes of transmission of each of the following diseases :
(i) Syphilis (ii) Tuberculosis (iii) Jaundice (iv) Japanese encephalitis [SAII -2012]

Q 15.

Define Health? What do you interpret when we say a person is in good health?

Q 16.

What is the alternate name of brain fever? Which vector is responsible for this disease?

Q 17.

What are the immunisation programmes available at the nearest health centre in your locality? Which of these diseases are the major health problems in your area?

Q 18.

What are the basic principles involved in medical treatment for diseases?

Q 19.

Why are kids and elderly people more vulnerable to cold/flu?

Q 20.

How can we prevent water borne and vector borne infections ?

Q 21.

State any two conditions essential for good health. [SAII-2014]

Q 22.

(i) Why a person suffering from AIDS cannot fight even small infections ?
(ii) In a slum area, many people are suffering from malaria. Mention any two unhygienic conditions that must be prevailing in that locality.
(iii) Why female Anopheles mosquito feeds on human blood ? [SAII – 2014]

Q 23.

What are the different means by which infectious diseases are spread ? [SAII – 2011, 2013]

Q 24.

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.

Q 25.

What precautions can you take in your school to reduce the incidence of infectious diseases ?

Q 26.

(a) What is immunisation ?
(b) Define immunity and vaccination.
(c) Define vaccine. .
(d) What type of diseases can be prevented through vaccination ? [SAII -2013]

Q 27.

Give any four factors necessary for a healthy person.

Q 28.

Why is AIDS considered to be a ‘Syndrome’ and not a disease ?

Q 29.

Name the target organs for the following diseases :
(a) Hepatitis targets…………
(b) Fits or unconsciousness targets…………
(c) Pneumonia targets…………
(d) Fungal disease targets…………

Q 30.

Classify the following diseases as infectious or non-infectious :
(a) AIDS                        (b) Tuberculosis
(c) Cholera                  (d) High blood pressure
(e) Heart disease       (f) Pneumonia
(g) Cancer

Q 31.

What is a disease ? How many types of diseases have you studied ? Give examples.

Q 32.

Becoming exposed to or infected with an infectious microbe (toes not necessarily mean developing noticeable disease. Explain.

Q 33.

You have suffered from chickenpox, when you were in class three. Why will you not suffer from it again ? [SAII -2014]

Q 34.

AIDS is a fatal disease. Explain why. [SAII – 2014]

Q 35.

Why making anti-viral medicines is harder than making anti-bacterial medicines ?

Q 36.

State giving reasons whether the following statements are correct or not:

  1.  Our surrounding area should be free from stagnant water.
  2. Staying clean is not necessary as long as you eat a balanced diet.
  3.  Social equality and harmony are necessary for good health.

Q 37.

Kidneys of a person do not filter urine properly. How does it affect physical, mental and social dimensions of that person?

Q 38.

State any two conditions essential for being free of disease.

Q 39.

What is a balanced diet?

Q 40.

(i) How do you define 'disease'? (ii) State and explain in brief the four major factors, which are the causes of disease.

Q 41.

Is there any difference between 'being healthy' and 'disease free'?

Q 42.

In which of the following case do you think the long-term effects on your health are likely to be most unpleasant? a. if you get jaundice, b. if you get lice, c. if you get acne. Why?

Q 43.

Give examples of Acute diseases.

Q 44.

Name a disease which was earlier considered to be chronic but now can be treated in short duration?

Q 45.

Write few common signs and symptoms of a disease if a brain is affected.

Q 46.

List any two differences between infectious and non-infectious diseases. Write any one example of each disease.

Q 47.

What is 'germ theory of disease'? Who proposed it?

Q 48.

What are Koch's Postulates?

Q 49.

Name the pathogen causes peptic ulcer.

Q 50.

Name the microbe which causes acne.