A scientist wants to find out how the concentration of nitrate ions in a growing solution affects the growth of wheat seedlings.
Describe a method the scientist could use. Your method should include the measurements the scientist would make.
Give one reason why measuring the dry mass of the seedlings would be a better measure of growth than measuring their height.
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.