A crop adviser examines spinach plants whose leaves have developed chlorosis.
Which treatment is most likely to increase the amount of chlorophyll in the leaves?
Apply fertiliser containing magnesium ions
Spray the leaves with an antibacterial chemical
Apply fertiliser containing nitrate ions
Release ladybirds to feed on aphids
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.