Class 9 - Biology
What is a disease ? How many types of diseases have you studied ? Give examples.
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 â€” acute / chronic / infectious / non-infectious. Examples : Influenza, tuberculosis, pneumonia, cancer respectively.
Questions and Answers
Why Do We Fall Ill? - Questions
Why does intake of penicillin not affect human cells ? [SAll – 2014]
What are three dimensions of health? Are they interrelated?
What are congenital diseases? Give two examples of such disease.
4. Name the protozoan pathogen that causes kala-azar.
5. Why is it important that we think of these categories of infectious agents?
6. What is immunisation?
7. Why Colostrum is good for infants?
8. How do Skin, Hairs, Saliva form the first line of defence against diseases?
Name two diseases caused by Protozoans. What are their causal organisms ?
What is an antibiotic ? Give two examples.
How can we prevent water borne and vector borne infections ?
Name the pathogens which can cause acne and sleeping sickness. [SAII -2014]
State any two conditions essential for good health. [SAII-2014]
Why are we normally advised, to take bland and nourishing food when we are sick ? [SAII – 2011, 2013]
Differentiate between acute diseases and chronic diseases.
(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]
(i) What are the various ways to prevent the diseases ?
(ii) What is immunisation ?
State two principles of treatment of a disease.
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 ?
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 ?
Give any four factors necessary for a healthy person.
What do you mean by disease symptoms ? Explain giving two examples.
AIDS is a fatal disease. Explain why. [SAII – 2014]
Differentiate between communicable and non-communicable diseases. Give one example of each.
25. Define Health? What do you interpret when we say a person is in good health?
26. State any two conditions essential for good health.
27. Are the answers to the above questions (Q2 and Q5) and necessarily the same or different? Why?
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.
29. What is the difference between symptoms and signs of a disease?
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?
31. Give four examples of Chronic diseases.
32. List any two differences between infectious and non-infectious diseases. Write any one example of each disease.
33. What are infectious agents? What are the different infectious agents?
34. What are Koch's Postulates?
35. List the diseases caused by viruses?
36. Give examples of fungal diseases.
37. Name the pathogen causes peptic ulcer.
38. Name the microbe which causes acne.
39. What is the scientific name of roundworm? Where do we find it commonly in the human body? Name the disease caused by it.
40. Give an example of fungal antibiotic.
41. Name the vectors which can cause rabies.
Why is it not necessary to give Hepatitis A vaccine to children?
43. Why it is advisable to breast feed the baby for first few several weeks?
44. Why do people staying in air-conditioned homes/offices catch cold more often?
45. Write differences between 'Being Healthy' and 'Disease Free'.
46. What is the difference between congenital diseases and acquired disease?
Name any two groups of microorganisms from which antibiotics could be extracted.
What is the purpose of vaccination ?
(i) Which bacterium causes peptic ulcers ?
(ii) Who discovered the above pathogen for the first time ?
List any four essential factors that must be taken icare of by an individual for keeping good health.
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