A grower compared the yields of barley plots of the same area and variety. All other growing conditions were kept the same.
| Water availability | Fungal disease | Yield (tonnes per hectare) |
|---|---|---|
| Adequate | Absent | 8.0 |
| Adequate | Present | 6.8 |
| Reduced | Absent | 6.4 |
| Reduced | Present | 5.1 |
Use the data to explain whether fungal disease alone accounts for the difference in yield between the plot with adequate water and no fungal disease and the plot with reduced water and fungal disease.
127 exam-style questions on OCR GCSE Biology 6.2 Feeding the human race, covering 6.2.1 Biological factors affecting food security, 6.2.2 Agricultural solutions to growing demand, 6.2.3 Selective breeding, 6.2.4 Genetic engineering, 6.2.5 Steps in genetic engineering, 6.2.6 Benefits and risks of gene technology in agriculture, and 6.2.7 Biotechnological solutions to growing demand. Each one has a worked solution and a mark scheme showing where the marks go.