A genetically engineered crop produces a substance that kills a particular insect pest. Matched field trials give the results in the table.
| Pest population | Conventional crop yield / kg per hectare | GM crop yield as a percentage of conventional crop yield |
|---|---|---|
| High | 4000 | 150 |
| Low | 8000 | 105 |
Which statement correctly compares the absolute yield gains and evaluates the evidence?
The gain is five times larger with high pest numbers; effects on other insects still need investigation.
The gain is five times larger with high pest numbers; effects on other insects have been ruled out.
The gain is ten times larger with high pest numbers; effects on other insects still need investigation.
The gain is ten times larger with high pest numbers; effects on other insects have been ruled out.
44 exam-style questions on AQA GCSE Biology 6.2 Variation and evolution, covering 6.2.1 Variation, 6.2.2 Evolution, 6.2.3 Selective breeding, 6.2.4 Genetic engineering, and 6.2.5 Cloning. Each one has a worked solution and a mark scheme showing where the marks go.