9-Std World of Microbes Complete Material

9th Standard

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Science

Time : 02:30:00 Hrs
Total Marks : 90
    10 x 1 = 10
  1. Mycology is the branch of biology that deals with the study of

    (a)

    algae

    (b)

    virus

    (c)

    bacteria

    (d)

    fungi

  2. The major constituent of vinegar is

    (a)

    citric acid

    (b)

    acetic acid

    (c)

    oxalic acid

    (d)

    hydrochloric acid

  3. Bacteria involved in curd formation is

    (a)

    Lactobacillus acidophilus

    (b)

    Nitosomonas

    (c)

    Bacillus ramous

    (d)

    none of the above

  4. Which of the following is transmitted through air?

    (a)

    Tuberculosis

    (b)

    Meningitis

    (c)

    Typhoid

    (d)

    Cholera

  5. Syphilis is caused by

    (a)

    Treponema pallidum

    (b)

    Leptospira

    (c)

    Pasteurella

    (d)

    Vibrio cholerae

  6. Diptheria affects the

    (a)

    Lungs

    (b)

    Throat

    (c)

    Blood

    (d)

    Liver

  7. Which of the following disease is spread by animal bite?

    (a)

    Pneumonia

    (b)

    Tuberculosis

    (c)

    Cholera

    (d)

    Rabies

  8. The primary organ infected during tuberculosis is

    (a)

    bone marrow

    (b)

    intestine

    (c)

    spleen

    (d)

    lungs

  9. The organ affected by jaundice is

    (a)

    liver

    (b)

    lungs

    (c)

    kidney

    (d)

    brain

  10. Severity of disease symptom depends upon

    (a)

    number of microbes

    (b)

    target organ

    (c)

    both a and b

    (d)

    none of these.

  11. 10 x 1 = 10
  12. ______________ break down organic matter and animal waste into ammonia.

    ()

    Putrefying bacteria and fungi

  13. The hyphae with branches form a complex network called ______________.

    ()

    Mycelium

  14. First antibiotic ______________ was developed by ______________.

    ()

    Penicillin, Alexander Flemming

  15. Baker’s yeast is ______________.

    ()

    Saccharomyces cerevisiae

  16. The two non symbiotic nitrogen fixing bacteria are ______________ and ______________.

    ()

    Nitrosomonas, Nostac

  17. Typhoid fever is caused by _____________.

    ()

    Salmonella typhi

  18. H1N1 virus causes ______________.

    ()

    Swine flu

  19. ______________ is a vector of viral disease dengue.

    ()

    Aedes mosquitoes

  20. _____________ vaccine gives considerable protection against tuberculosis.

    ()

    BCG

  21. Cholera is caused by ______________ and malaria is caused by ______________.

    ()

    Vibrio cholerae, Plasmodium falciparum

  22. 5 x 2 = 10
  23. Name the chronic diseases associated with respiratory system.

  24. Name the scientist who first discovered penicillin antibiotic. Can you name any other known antibiotic?

  25. Name the organism causing diarrhoeal diseases and give one precaution against it.

  26. Name two common mosquitoes and the diseases they transmit.

  27. Name one disease that is transmitted by houseflies. Mention their causative pathogen.

  28. 5 x 2 = 10
  29. Define the following.
    1. Pathogen
    2. Bacteriophages
    3. Plasmid
    4. Vaccines
    5. Prions

  30. Define the Bacteriophages

  31. Define the Plasmid

  32. Define the Vaccines

  33. Define the Prions

  34. 5 x 3 = 15
  35. Distinguish between Virion and Viroid.

  36. A baby is suffering from diarrhoea, while other babies in the same locality do not. Mention the possible causes that you think. What would be the possible solutions for this?

  37. Name the vector of the malarial parasite. Mention the species of malarial parasite which cause malignant and fatal malaria.

  38. What is triple antigen? Mention the disease which can be prevented by using the antigen.

  39. Sanjay had an attack of chicken pox and has just recovered. The health officer of his locality says that the disease would not occur again for him. What would be the reason for this?

  40. 6 x 5 = 30
  41. Give an account of classification of bacteria based on the shape.

  42. Describe the role of microbes in agriculture and industries.

  43. Explain the various types of viruses with examples.

  44. Suggest the immunization schedule for a new born baby till 12 months of age. Why it is necessary to follow the schedule?

  45. Name the causative agent of typhoid in human. How does the pathogen gain entry into the human body? Write the diagnostic symptoms and mention the organ that is affected in severe cases.

  46. Some human diseases are transmitted only when the blood of a patient comes in close contact with the blood of a healthy person. In one such disease, there is a progressive decrease in WBC of the patient.
    a. Name the disease and its causative agent.
    b. Name the type of WBC affected during infection.
    c. How does the blood of a patient come in contact with blood of healthy patient?
    d. Suggest three methods that help in preventing such infection.

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