A student sprayed rose bushes with different volumes of a fungicide to find out how well it controls rose black spot. What is the dependent variable in this investigation?
The volume of fungicide sprayed onto each rose bush each week
The number of rose leaves with black spot after four weeks
The variety of rose bush that is used in the investigation
The volume of water given to each rose bush each day
176 exam-style questions on AQA GCSE Biology 3.1 Communicable diseases, covering 3.1.1 Communicable (infectious) diseases, 3.1.2 Viral diseases, 3.1.3 Bacterial diseases, 3.1.4 Fungal diseases, 3.1.5 Protist diseases, 3.1.6 Human defence systems, 3.1.7 Vaccination, 3.1.8 Antibiotics and painkillers, and 3.1.9 Discovery and development of drugs. Each one has a worked solution and a mark scheme showing where the marks go.