Some gardeners believe that spraying a dilute solution of seaweed extract onto the leaves of cabbage plants reduces the grazing damage caused by cabbage white butterfly caterpillars (Pieris brassicae).
Design an investigation to determine whether cabbage white butterfly caterpillars are less likely to feed on cabbage leaves that have been sprayed with seaweed extract compared to those that have not.
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.