A chemical is removed from some leaves without changing their physical structure. Caterpillars eat more of these leaves than untreated leaves. The caterpillars survive in both groups.
Which conclusion is supported?
the chemical kills caterpillars but is not shown to deter feeding
the chemical deters feeding but is not shown to kill caterpillars
the chemical forms a barrier but is not shown to deter feeding
the chemical attracts caterpillars but is not shown to kill them
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.