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Gcse Science
Biology - Natural Defences (Aqa)
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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 neutralise pathogens
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They produce antitoxins to neutralise 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 neutralise 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 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.5
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 neutralise toxins from pathogens
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They destroy pathogens by ingesting them
Q.6
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.7
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
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