The same insecticide is sprayed in one region for 15 years. The number of cases of malaria in the region begins to rise again. What is the most likely reason?
The protists in the blood are now resistant to the insecticide used
The people in the region are now immune to the insecticide used
The insecticide is now broken down by the protists in the mosquito
The mosquitoes in the region are now resistant to the insecticide used
252 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.