Volunteers look after a rose bush in a community garden. The bush develops purple or black spots on its leaves. Later, some of the leaves turn yellow and fall off.
Name the disease affecting the rose bush.
Give the effect on the rate of photosynthesis of the rose bush losing some of its leaves.
Suggest how the volunteers could use a gardening website to identify the disease.
133 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.