A forestry project grows tree seedlings in two separate rooms under the same conditions.
At the start, one seedling in each room was infected with the same fungal pathogen. At each check, workers removed any seedling that showed signs of disease.
The table shows the results after 28 days.
| Room | How often the seedlings were checked | Total number of seedlings that became infected |
|---|---|---|
| A | Every day | 12 |
| B | Every 7 days | 54 |
Calculate the percentage reduction in the total number of seedlings that became infected when the seedlings were checked every day rather than every 7 days.
The project sets up a third room under the same conditions. Workers check the seedlings every day and label any seedlings showing signs of disease. However, labelled seedlings are removed only once every 7 days.
Predict the total number of seedlings that will become infected after 28 days. Use the data in the table to explain your answer.
133 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.