Discussing resource use means comparing how much land, water, feed or energy each method needs for the same amount of food. Express each resource per unit of output, then write a verdict that names what it covers.
This lesson is part of nutrition and food technology. It applies the routine from comparing processing methods using evidence.
What does a fair comparison need?
A fair comparison needs the same crop, the same time and the same output measure. Then each resource is divided by the output so the farms line up.
Without that step, a big farm looks wasteful and a small farm looks careful, which says nothing about method.
Worked example: two vegetable farms
The table is original, with invented values for one harvest of the same leafy vegetable.
| Farm P (hydroponic) | Farm Q (soil) | |
|---|---|---|
| Output | 1 000 kg | 1 000 kg |
| Land used | 80 m² | 400 m² |
| Water used | 90 m³ | 250 m³ |
| Electricity used | Not listed | Not listed |
Per 100 kg. The outputs are equal, so divide by 10. Farm P uses 8 m² of land and 9 m³ of water per 100 kg. Farm Q uses 40 m² of land and 25 m³ of water.
Verdict. Farm P uses one fifth of the land (80 ÷ 400 = 0.2) and 36% of the water (90 ÷ 250 = 0.36). For land and water, Farm P uses fewer resources.
Assumptions. Both farms grew the same vegetable in the same time. The table does not list electricity, so the verdict cannot cover energy use.
The mistake that costs marks
The common slip is to write that hydroponics is better overall. The table has no energy column, so “overall” claims more than the data shows.
| Step | Wrong | Right |
|---|---|---|
| Compare | Farm P is better | Farm P uses less land and water per 100 kg |
| Scope | Better overall | Better for the two resources listed |
| Missing data | Ignored | Electricity is not listed, so unknown |
| Wording | Fact | Supported by the data |
The fix is to write the resource after the verdict, and to mention any column that the table lacks.
An assumptions checklist
Before you submit a discussion answer, run through four quick questions.
- Are both cases the same crop or animal?
- Are they measured over the same time?
- Is each resource divided by the same output?
- Which resource does the table leave out?
Naming one of these in a clause, such as “assuming the same crop”, is usually enough. The graph evidence and fair-comparison lab trains the same habit on graphs.
Check yourself
Poultry Farm A uses 2.0 kg of feed for every 1.0 kg of meat produced. Farm B uses 1.6 kg of feed per 1.0 kg of meat. Each farm plans to produce 500 kg of meat. How much feed does each need, and what must you assume?
Answer
Farm A needs 2.0 × 500 = 1 000 kg of feed. Farm B needs 1.6 × 500 = 800 kg.
Farm B needs 200 kg less feed for the same meat output, which is 20% of Farm A’s feed (200 ÷ 1 000 = 0.2).
Assumptions: both farms raise the same breed to the same age, and the feed figures stay the same at 500 kg as at the rates given.
What to study next
Test all four lessons together with the nutrition and food technology practice set. If you slip on the comparison step, return to reading nutritional data.
If you want a teacher to go through your discussion answers with you, see online one-to-one Science tuition.