A seaweed-derived foliar spray is claimed to reduce the infestation of tomato plants by red spider mites.
Design an investigation to find out if tomato plants sprayed with this seaweed extract are less likely to be infested by red spider mites than plants that are not treated with the extract.
Your answer should include experimental details and be written in full sentences.
31 exam-style questions on Edexcel IGCSE Biology The organism in the environment. Each one has a worked solution and a mark scheme showing where the marks go.