Deadly nightshade, foxglove and yew plants all make poisons in their leaves. Making a poison uses glucose and energy that the plant could otherwise use for growth.
Explain how making a poison is an advantage to these plants.
Suggest one disadvantage to a plant of making a poison.
A poison does not protect a plant against a bacterial disease. Name the type of chemical defence that does protect a plant against bacteria.
Scientists are testing chemicals made by plants as possible new medicines. Suggest one reason why plants are a useful source of new antibacterial medicines.
58 exam-style questions on AQA GCSE Biology 3.3 Plant disease, covering 3.3.1 Detection and identification of plant diseases and 3.3.2 Plant defence responses. Each one has a worked solution and a mark scheme showing where the marks go.