A scientist grows cuttings from each of two parent plants, P and Q. Each group receives the same water and mineral ions. The table shows the mean heights after eight weeks.
| Parent plant | Height in bright light / cm | Height in dim light / cm |
|---|---|---|
| P | 24 | 16 |
| Q | 18 | 10 |
Which comparison provides evidence for an environmental effect, and which provides evidence for a genetic effect?
Environmental: P and Q in bright light; genetic: P in bright and dim light.
Environmental: P in bright and dim light; genetic: P and Q in bright light.
Environmental: P and Q in bright light; genetic: P and Q in dim light.
Environmental: P in bright and dim light; genetic: Q in bright and dim light.
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.