Middle School: 6th, 7th and 8th Grade - Biology - Biology - Natural Defences Solution

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?

Q.3.

What is produced by a lymphocyte that enables it to neutralize pathogens?

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?

Q.6.

Which of the following is one of the ways that white blood cells provide active immunity?

Q.7.

Which of the following are the two main groups of white blood cells?

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:

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