A fungal pathogen infects the leaves of chrysanthemum plants and produces dark spots.
A scientist grew two groups of equal-sized chrysanthemum plants under the same conditions for six weeks. One group was infected with the pathogen.
| Group | Mean total leaf area in cm² | Mean number of flowers per plant |
|---|---|---|
| Uninfected | 2400 | 24 |
| Infected | 1560 | 15 |
Calculate the percentage by which the mean total leaf area of the infected plants was lower than that of the uninfected plants.
Explain why the infected plants produced fewer flowers than the uninfected plants. Use data from the table.
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.