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5.2 Plant and body defences

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Question 1
F

The Figure shows some of the cells lining the trachea.

Figure

image

a.

Cell X produces mucus.

Describe the role of mucus in defending the body against pathogens.

[2]
b.

Explain how the cilia on cell Y help to stop pathogens reaching the lungs.

[2]
c.

Chemicals in cigarette smoke stop cilia from moving.

Explain why smokers often cough up mucus and get more chest infections than non-smokers.

[3]
d.

Mucus that reaches the throat is swallowed.

Explain why pathogens in swallowed mucus are unlikely to cause disease.

[2]
Markscheme

5.2 Plant and body defences Questions

  1. GCSE
  2. /Biology
  3. /5.2 Plant and body defences

45 exam-style questions on Edexcel GCSE Biology 5.2 Plant and body defences, covering 5.2.1 Physical plant defences, 5.2.2 Chemical plant defences, 5.2.3 Detecting plant diseases, and 5.2.4 Human physical and chemical defences. Each one has a worked solution and a mark scheme showing where the marks go.

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