An outdoor grower applies nitrate fertiliser to strawberry plants grown in bags. Drainage water from the site flows into a nearby lake.
The crop contains 400 plants. Nitrate fertiliser costs £2.00 £2.00\,£2.00 per kg\text{kg}kg. All harvested strawberries are sold for £4.00 £4.00\,£4.00 per kg\text{kg}kg.
The table shows results from a trial.
| Mass of nitrate fertiliser applied per plant in g | 12 | 18 |
|---|---|---|
| Mean mass of strawberries harvested per plant in g | 610 | 612 |
Calculate the change in profit for the whole crop if the grower increases the mass of nitrate fertiliser from 12 g to 18 g per plant. Give your answer as an increase or a decrease.
Explain how using 12 g rather than 18 g of nitrate fertiliser per plant could reduce damage to the nearby lake.
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.