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Middle School: 6th, 7th and 8th Grade
Biology
Biology - Natural Defences
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Q.1
Which of the following statements about white blood cells is ?
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They engulf and ingest pathogens
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They expel the pathogens from the bloodstream via the liver
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They produce antibodies which neutralize pathogens
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They produce antitoxins to neutralize the effects of the toxins from pathogens
Q.2
Your body can develop a natural immunity to certain pathogens. What is the name of the cells responsible for this?
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Lymphocytes
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Leucocytes
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Phagocytes
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Virocytes
Q.3
What is produced by a lymphocyte that enables it to neutralize pathogens?
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Antigens
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Antipaths
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Antibodies
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Antibacts
Q.4
Which of the following statements is correct?
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Passive immunity involves receiving antibodies
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Antibiotics work because the prevent the toxins from being poisonous to the host
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White blood cells produce antigens to protect the body
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Viruses cause cholera and typhoid in poor areas of the world
Q.5
Which of the following also help your body defend itself against infection?
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Mucus and cilia in the respiratory system
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Hydrochloric acid in the stomach
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Lysozyme (an enzyme) in tears
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All three of the above
Q.6
Which of the following is one of the ways that white blood cells provide active immunity?
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They destroy invading pathogens by eating them
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They produce antibodies to destroy pathogens
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They produce antitoxins that neutralize toxins from pathogens
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They destroy pathogens by ingesting them
Q.7
Which of the following are the two main groups of white blood cells?
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Phagocytes and lymphocytes
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Stem cells and platelets
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Macrophages and bacteriophages
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Erythrocytes and monocytes
Q.8
The lymphocytes produce antibodies. How do antibodies work?
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They penetrate inside the pathogen and destroy its nucleus
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They penetrate inside the pathogen and change the chemical composition of the cytoplasm
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They attach to the pathogens and cause them to clump together making it easy for phagocytes to find and ingest them
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They attach to the pathogens and take them to the liver where they are destroyed
Q.9
Vaccination is used to immunize people against diseases. Pick the statement:
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Edward Jenner is credited with the discovery of vaccination
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Vaccines contain the antibodies needed to protect your body from infection
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Each vaccine protects you from a specific disease
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Some vaccines contain the pathogen that causes the disease
Q.10
Why are antibiotics no good for treating colds and 'flu?
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Colds and 'flu are viral infections
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Cold and 'flu mutate too quickly so the antibiotics only work for a very short time
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Colds and 'flu are 'superbugs' and totally resistant to antibiotics
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Antibiotics cannot work fast enough to treat colds and 'flu
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