Why Do We Fall Ill?


The signs and symptoms of a disease will depend on the tissue or organ which the microbe targets Justify the statement with two examples. [SAll – 2014]


Every microorganism shows its effect on any particular tissue or organ after entering into the body. Thus, there is a change in the structure and function of that tissue or organ. For example, if the lungs are the targets, the symptoms will be cough and breathlessness. If the liver is the target, there will be jaundice. This is called Organ specific manifestation.


Why Do We Fall Ill?

Q 1.

List any three reasons why you would think that you are sick and ought to see a doctor. If only one of these symptoms were present, would you still go to the doctor? Why or why not?

Q 2.

Give any four factors necessary for a healthy person.

Q 3.

How do we identify a disease?

Q 4.

Give two examples of bacterial antibiotics.

Q 5.

Under which of the following conditions is a person most likely to fall sick ?
(a) When she is recovering from malaria.
(b) When she has recovered from malaria and is taking care of someone suffering from
(c) When she is on a four-day fast after recovering from malaria and is taking care of someone suffering from chickenpox. Why ?

Q 6.

“On exposure with an infectious microbe does not necessarily mean developing noticeable disease”. Do you agree ? Explain with reason. If yes, how severe infections occur in our body ?

Q 7.

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

Q 8.

Give four modes of transmission of AIDS.

Q 9.

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

Q 10.

What do you mean by disease symptoms ? Explain giving two examples.

Q 11.

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 12.

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

Q 13.

What is an antibiotic ? Give two examples.

Q 14.

Who discovered ‘vaccine’ for the first time ? Name two diseases which can be prevented by using vaccines.

Q 15.

Why is immune system essential for our health ?

Q 16.

Common cold spreads faster and is difficult to control. Give reason. [SAII -2014]

Q 17.

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

Q 18.

State any two conditions essential for being free of disease.

Q 19.

Name the vector that can cause sleeping sickness.

Q 20.

Why do people staying in air-conditioned homes/offices catch cold more often?

Q 21.

Write three differences between Personal Health and Community Health.

Q 22.

Give two examples for each of the following :
(a) Acute diseases
(b) Chronic diseases
(c) Infectious diseases
(d) Non-infectious diseases.

Q 23.

(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 24.

Classify infectious agents into different categories and also mention the diseases caused by them.

Q 25.

Why are antibiotics not effective for viral disease ?

Q 26.

What are acquired diseases?

Q 27.

Explain why antibiotics are more effective in curing bacterial diseases than viral diseases.

Q 28.

What are the different means by which infectious diseases are spread?

Q 29.

Name the vectors which can cause rabies.

Q 30.

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 31.

Why Colostrum is good for infants?

Q 32.

List any four essential factors that must be taken icare of by an individual for keeping good health.

Q 33.

(i) What is an epidemic disease ?
(ii) Which organ is affected if a person is suffering from jaundice ?

Q 34.

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

Q 35.

State two principles of treatment of a disease.

Q 36.

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

Q 37.

What do you mean by immune response ? , [SAII – 2014]

Q 38.

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

Q 39.

Differentiate between communicable and non-communicable diseases. Give one example of each.

Q 40.

Give examples of Acute diseases.

Q 41.

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

Q 42.

What are infectious agents? What are the different infectious agents?

Q 43.

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

Q 44.

Name the microbe which causes acne.

Q 45.

Why taking an antibiotic is not effective in the common cold?

Q 46.

Why it is advisable to breast feed the baby for first few several weeks?

Q 47.

What is the purpose of vaccination ?

Q 48.

Many vaccines form the public health programme of childhood immunisation for preventing infectious disease. Name any two such diseases.

Q 49.

Majority of children in many parts of India are already immune to Hepatitis A by the time they are five years old. Why ?

Q 50.

Name two diseases caused by Protozoans. What are their causal organisms ?