An apple grower uses predictions to plan for changes in seasonal rainfall. The table gives predicted changes in apple yield.
| Decrease in seasonal rainfall in %\%% | Predicted change in apple yield in %\%% |
|---|---|
| 0 | 0 |
| 10 | -8 |
| 20 | -16 |
| 30 | -25 |
The grower plans for a 15% decrease in seasonal rainfall. This lies halfway between two of the rainfall reductions in the table. State the estimated percentage change in yield.
The farm's usual harvest is 500 tonnes. Calculate the predicted harvest, in tonnes, for a 20% decrease in seasonal rainfall.
Explain how drought can reduce the yield of apples.
The grower irrigates the apple trees using underground water. State why taking this water out faster than rainfall replaces it is not sustainable.
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.