Scientists collected leaf beetles from two strawberry fields.
The same insecticide had been sprayed on field X every year for six years. This insecticide had not been used on field Y.
The beetles were exposed to the same concentration of the insecticide for 24 hours.
| Field | Number of beetles tested | Number of beetles surviving |
|---|---|---|
| X | 240 | 156 |
| Y | 180 | 27 |
Calculate the difference in percentage survival between the beetles from field X and the beetles from field Y.
Explain the difference in survival between the two populations and predict which field is likely to have the lower crop yield if only this insecticide is used next year.
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.