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Immunity and disease

Written by Dr. Hira Salman (Biology)

8 Class 12 Biology questions with answers and explanations.

Printable worksheet with answer key

All questions with answers
  1. Antibodies are made by:

    • 1 Platelets
    • 2 Neurons
    • 3 Red blood cells
    • 4 B lymphocytes
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    Correct answer: B lymphocytes

    B cells produce antibodies after meeting an antigen.

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  2. Vaccination gives:

    • 1 Temporary relief only
    • 2 Active immunity
    • 3 No immunity
    • 4 Passive immunity only
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    Correct answer: Active immunity

    The body makes its own antibodies and memory cells.

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  3. Mosquitoes spread:

    • 1 Tuberculosis
    • 2 Malaria
    • 3 Cholera
    • 4 Measles
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    Correct answer: Malaria

    The Anopheles mosquito carries malaria.

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  4. AIDS is caused by:

    • 1 A protozoan
    • 2 A fungus
    • 3 HIV
    • 4 A bacterium
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    Correct answer: HIV

    The virus damages helper T cells.

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  5. Tuberculosis is caused by:

    • 1 A virus
    • 2 A protozoan
    • 3 A bacterium
    • 4 A fungus
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    Correct answer: A bacterium

    Mycobacterium tuberculosis causes TB.

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  6. The first line of defence of the body against pathogens is the:

    • 1 Antibodies
    • 2 Skin
    • 3 Vaccines
    • 4 Memory cells
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    Correct answer: Skin

    Skin is a physical barrier.

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  7. A substance that triggers an immune response is an:

    • 1 Antibody
    • 2 Enzyme
    • 3 Hormone
    • 4 Antigen
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    Correct answer: Antigen

    Antigens are recognised as foreign.

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  8. Passive immunity can be gained from:

    • 1 A vaccine
    • 2 Exercise
    • 3 Having the disease
    • 4 Mother's milk
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    Correct answer: Mother's milk

    Antibodies are passed from the mother.

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