A plant chemical is used in a medicine that reduces pain but does not kill the pathogen causing an infection. What is the action of this medicine?
it removes the cause without relieving a symptom
it forms a barrier without affecting the symptom
it relieves a symptom without removing the cause
it kills the pathogen without affecting the cause
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.