A farmer tests fertiliser treatments on equal-sized plots.
Table
| Treatment | Grain yield / kg | Fertiliser cost / £ | Nitrate lost / g |
|---|---|---|---|
| P | 400 | 10 | 5 |
| Q | 520 | 25 | 12 |
| R | 560 | 40 | 28 |
| S | 570 | 60 | 45 |
The farmer needs a yield of at least 500 kg and nitrate loss below 30 g. Grain sells for £0.50 per kg.
Which treatment gives the greatest income after subtracting fertiliser cost while meeting both limits?
S
R
Q
P
44 exam-style questions on Edexcel GCSE Biology 4.3 Selective breeding and genetic modification, covering 4.3.1 Selective breeding and its impact, 4.3.2 Tissue culture, 4.3.3 Genetic engineering overview, 4.3.4 Main stages of genetic engineering, 4.3.5 Advantages and disadvantages of GM organisms, 4.3.6 Agricultural solutions for a growing population, and 4.3.7 Evaluating genetic engineering and breeding. Each one has a worked solution and a mark scheme showing where the marks go.