A plant breeder has selectively bred barley for high grain yield over many generations. An old variety and the new variety were grown on trial plots in the same conditions.
| Variety | Mean grain yield in tonnes per hectare |
|---|---|
| Old variety | 4.6 |
| New variety | 7.3 |
Calculate the percentage increase in mean grain yield of the new variety compared with the old variety.
Give your answer to 1 decimal place.
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.