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5.2 Plant and body defences

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Question 20
F

Bacteria enter the mouth with food and are swallowed. Which sequence describes a chemical defence they may encounter?

[1]
A

they enter the stomach, where hydrochloric acid kills many bacteria

B

they enter the stomach, where mucus carries bacteria to the throat

C

they enter the lungs, where hydrochloric acid kills many bacteria

D

they enter the lungs, where cilia break down bacterial cell walls

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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