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5.2 Plant and body defences

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Question 34
H

A sample contains 800 bacteria. Mucus traps 75% of them. Of the trapped bacteria, 90% are moved to the throat by cilia.

How many bacteria from the original sample have not been moved to the throat?

[1]
A

60 bacteria

B

200 bacteria

C

260 bacteria

D

540 bacteria

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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