Pathogens can enter the human body through the mouth and the nose.
Explain how the physical barriers and chemical defences of the body protect against pathogens that enter through the mouth and the nose.
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.