biology - why do we fall ill?

Class 9 - Biology

Why Do We Fall Ill?

MCQ
Q&A
Notes
Question:

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

Answer:

When the functioning or the appearance of one or more systems of the body change for the worse, the body is said to be diseased. The diseases can be — acute / chronic / infectious / non-infectious. Examples : Influenza, tuberculosis, pneumonia, cancer respectively.



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Questions and Answers


Why Do We Fall Ill? - Questions
1.

Why does intake of penicillin not affect human cells ? [SAll – 2014]


Answer
2.

What are three dimensions of health? Are they interrelated?


Answer
3.

What are congenital diseases? Give two examples of such disease.


Answer
4. Name the protozoan pathogen that causes kala-azar.
Answer
5. Why is it important that we think of these categories of infectious agents?
Answer
6. What is immunisation?
Answer
7. Why Colostrum is good for infants?
Answer
8. How do Skin, Hairs, Saliva form the first line of defence against diseases?
Answer
9.

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


Answer
10.

What is an antibiotic ? Give two examples.


Answer
11.

How can we prevent water borne and vector borne infections ?


Answer
12.

Name the pathogens which can cause acne and sleeping sickness. [SAII -2014]


Answer
13.

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


Answer
14.

Why are we normally advised, to take bland and nourishing food when we are sick ? [SAII – 2011, 2013]


Answer
15.

Differentiate between acute diseases and chronic diseases.


Answer
16.

(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]


Answer
17.

(i) What are the various ways to prevent the diseases ?
(ii) What is immunisation ?


Answer
18.

State two principles of treatment of a disease.


Answer
19.

In which of the following case do you think the long-term effects on your health are likely to be most unpleasant ?

  •  if you get jaundice ?
  •  if you get lice ?
  •  if you get acne. Why ?

 


Answer
20.

A baby is not able to tell her / his caretakers that she / he is sick. What would help us to find out:
(a) that the baby is sick ?
(b) what is the sickness ?


Answer
21.

Give any four factors necessary for a healthy person.


Answer
22.

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


Answer
23.

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


Answer
24.

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


Answer
25. Define Health? What do you interpret when we say a person is in good health?
Answer
26. State any two conditions essential for good health.
Answer
27. Are the answers to the above questions (Q2 and Q5) and necessarily the same or different? Why?
Answer
28. A hefty boy of 12 years often picks fights with others. Do you think he is in good health? If so, then explain your answer.
Answer
29. What is the difference between symptoms and signs of a disease?
Answer
30. 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?
Answer
31. Give four examples of Chronic diseases.
Answer
32. List any two differences between infectious and non-infectious diseases. Write any one example of each disease.
Answer
33. What are infectious agents? What are the different infectious agents?
Answer
34. What are Koch's Postulates?
Answer
35. List the diseases caused by viruses?
Answer
36. Give examples of fungal diseases.
Answer
37. Name the pathogen causes peptic ulcer.
Answer
38. Name the microbe which causes acne.
Answer
39. What is the scientific name of roundworm? Where do we find it commonly in the human body? Name the disease caused by it.
Answer
40. Give an example of fungal antibiotic.
Answer
41. Name the vectors which can cause rabies.
Answer
42.

Why is it not necessary to give Hepatitis A vaccine to children?


Answer
43. Why it is advisable to breast feed the baby for first few several weeks?
Answer
44. Why do people staying in air-conditioned homes/offices catch cold more often?
Answer
45. Write differences between 'Being Healthy' and 'Disease Free'.
Answer
46. What is the difference between congenital diseases and acquired disease?
Answer
47.

Name any two groups of microorganisms from which antibiotics could be extracted.


Answer
48.

What is the purpose of vaccination ?


Answer
49.

(i) Which bacterium causes peptic ulcers ?
(ii) Who discovered the above pathogen for the first time ?


Answer
50.

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


Answer
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