MCQ Questions for Class 9 Science: Ch 13 Why do we fall ill?

MCQ Questions for Class 9 Science: Ch 13 Why do we fall ill?

1. Which of the following could be a cause for developing a disease?
(a) Exercising properly
(b) Having a balanced diet
(c) Poor personal hygiene
(d) Getting enough sleep
► (c) Poor personal hygiene

2. Sleeping sickness is caused by ____________, a protozoan.
(a) Trypanosoma
(b) Euglena
(c) Plasmodium
(d) Amoeba
► (a) Trypanosoma

3. Identify the group among the following, which contains all bacterial diseases :
(a) Typhoid, tuberculosis, anthrax
(b) Malaria, anthrax, typhoid
(c) Kala-azar, influenza, tuberculosis
(d) Tuberculosis, anthrax, dengue
► (a) Typhoid, tuberculosis, anthrax

4. Which is not a contributory cause of a person acquiring a water borne disease?
(a) Lack of sufficient food
(b) Attack by bacteria
(c) Genetic susceptibility to the disease
(d) Lack of clean drinking water
► (c) Genetic susceptibility to the disease

5. Suzan’s grandfather is suffering from tuberculosis. In which category will you put his disease?
(a) Chronic and acute both
(b) She cannot predict anything from this information.
(c) Chronic
(d) Acute
► (c) Chronic

6. We should not allow mosquitoes to breed in our surroundings because they
(a) multiply very fast and cause pollution
(b) are vectors for many diseases
(c) bite and cause skin diseases
(d) are not important insects
► (b) are vectors for many diseases

7. The process in which the active immune system employs many cells to the affected tissue, is called
(a) infection
(b) infestation
(c) invasion
(d) inflammation
► (d) inflammation

8. Choose the wrong statement:
(a) High blood pressure is caused by excessive weight and lack of exercise
(b) Cancers can be caused by genetic abnormalities
(c) Peptic ulcers are caused by eating acidic food
(d) Acne is caused by Staphylococci
► (c) Peptic ulcers are caused by eating acidic food

9. What is the importance of childhood immunisation programmes?
(a) These programmes give protection only when the child reaches adult stage.
(b) These programmes give lifelong protection against several infectious diseases
(c) These progremmes give temporary protection against diseases
(d) These programmes improve the health of some children
► (b) These programmes give lifelong protection against several infectious diseases

10. The vector for Yellow fever is:
(a) Mosquito
(b) Flea
(c) Housefly
(d) Rat
► (a) Mosquito

11. Which of the following is the literal meaning of disease?
(a) Being happy
(b) Being unaware
(c) Being uncomfortable
(d) Being uncomplicated
► (c) Being uncomfortable

12. Rejection of transplanted organ is prevented by regular use of 
(a) Cyclosporin
(b) Calcitonin
(c) Thrombin
(d) Pyroxin
► (a) Cyclosporin

13. Which one of the following is not a viral disease?
(a) Dengue
(b) AIDS
(c) Typhoid
(d) Influenza
► (c) Typhoid

14. The diseases where microbes are the immediate causes, are called
(a) infectious diseases
(b) non-infectious diseases
(c) chronic diseases
(d) acute diseases
► (a) infectious diseases

15. Antibiotics used in treatment of bacterial and fungal diseases are
(a) the names of useful bacteria
(b) toxins produced by bacteria
(c) drugs manufactured to kill viruses
(d) products of metabolism in some bacteria
► (d) products of metabolism in some bacteria

16. Acute diseases last for:
(a) Long period of time
(b) Only few hours
(c) Short period of time
(d) Life long
► (c) Short period of time

17. Antibiotics do not work against viral infections because
(a) viruses live only inside host cells.
(b) viruses do not have metabolic pathways of their own,
(c) viruses are resistant to antibiotics.
(d) the protein coat of viruses acts as a barrier to the antibiotics
► (b) viruses do not have metabolic pathways of their own,

18. ‘Public cleanliness is important for individual health’. Which of the following is an example of this statement?
(a) Brushing our teeth and taking bath everyday keeps our body clean
(b) Collecting and cleaning of garbage cans on the street regularly helps to prevent the spread of diseases
(c) Clean rooms in our houses are essential for healthy living
(d) Cutting nails regularly prevents dirt accumulation and infection in the nails
► (b) Collecting and cleaning of garbage cans on the street regularly helps to prevent the spread of diseases

19. The organisms which carry the infectious agents from a sick person to another potential host are known as
(a) Fomites
(b) Causative agents
(c) Vectors
(d) Vehicles
► (c) Vectors

20. Which one of the following is not a bacterial disease?
(a) Cholera
(b) Tuberculosis
(c) Anthrax
(d) Influenza
► (d) Influenza

21. Which of the following bacteria cause peptic ulcer?
(a) Helicobactor chlolecystus
(b) Helicobactor salomonis
(c) Helicobactor pylori
(d) Helicobactor hepaticus
► (c) Helicobactor pylori

22. Vectors can be defined as
(a) animals carry the infecting agents from sick person to another healthy person
(b) microorganisms which cause many diseases
(c) infected person
(d) diseased plants
► (a) animals carry the infecting agents from sick person to another healthy person

23. It was found that milkmaids who had cowpox did not suffer from smallpox later?
(a) Since small pox virus is closely related to cowpox virus.
(b) Scientists have not yet worked out the reason for this.
(c) Since cowpox is more deadly than smallpox.
(d) Since smallpox is more deadly than cowpox.
► (a) Since small pox virus is closely related to cowpox virus.

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

25. Jaundice is a disease of 
(a) kidney
(b) liver
(c) pancreas
(d) duodenum
► (b) liver

26. How does penicillin kill bacteria?
(a) Penicillin makes holes in the cell membrane.
(b) Penicillin interferes with the bacterial metabolism.
(c) Penicillin inhibits protein synthesis.
(d) Penicillin prevents cell wall formation.
► (d) Penicillin prevents cell wall formation.

27. Which one of the following has a long term effect on the health of an individual?
(a) Common cold
(b) Chicken pox
(c) Chewing tobacco
(d) Stress
► (c) Chewing tobacco

28. AIDS cannot be transmitted by
(a) sexual contact
(b) hugs
(c) breast feeding
(d) blood transfusion
► (b) hugs

29. A condition of failure of function of kidney to form urine is
(a) Creatinine
(b) Hematuria
(c) Alkaptoneuria​
(d) Anuria
► (d) Anuria

30. The set of diseases which spread through sexual contact as well as through placenta to the foetus are
(a) Malaria and AIDS
(b) AIDS and Syphili 
(c) Syphilis and Malaria
(d) AIDS and Cancer
► (b) AIDS and Syphili 

31. Malarial parasite after entering the human body reaches the
(a) liver and then RBCs
(b) stomach and then RBCs
(c) liver and then WBCs
(d) stomach and then salivary glands
► (a) liver and then RBCs

32. Which one of the following causes kala-azar?
(a) Ascaris
(b) Trypanosoma
(c) Leishmama
(d) Bacteria
► (c) Leishmama

33. Which of the following is not a symptom of any disease?
(a) Meningitis
(b) Headache
(c) Cough
(d) Swelling
► (a) Meningitis

34. Which of the following organism causes acne?
(a) Trypanosoma
(b) Lactobacillus
(c) Staphylococcus
(d) Plasmodium
► (c) Staphylococcus
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