中文（繁體）
中文（简体）
English
S5 Geography | Agriculture Paper 3 (Challenge)
S5 Geography | Agriculture Paper 3 (Challenge)
This paper does one thing: it costs the price of modern farming in numbers, from food miles through fertiliser intensity to the self-sufficiency ratio.
Attempt first, mark afterwards Allow thirty to thirty-five minutes; state every emission and water coefficient, and compute the old value before the new one to avoid mixing points and percentages.
01 Paper details (check answers afterwards)
| Item | Detail |
|---|---|
| Questions | 10 items |
| Suggested time | About 35 minutes |
| Difficulty mix | Foundation 4 · Intermediate 3 · Challenge 2 · Error redo 1 |
| Chapter | Chapter: S5 Geography | Agriculture |
| Level | S5 (Secondary 5) Geography |
02 Questions (10 items)
- FoundationWhich three technologies made up the Green Revolution, and what did they do to Asian rice yields?
- FoundationTwo tonnes of food travel 1,200 kilometres at 0.05 kilograms of carbon dioxide per tonne-kilometre. What are the food-mile emissions?
- FoundationA farm applies 300 kilograms of fertiliser per hectare over 80 hectares. What is the total, and how much is cut by 25 per cent?
- FoundationOrganic yields run 20 per cent below conventional. At 5.0 tonnes per hectare on 72 hectares, how far apart are the totals?
- IntermediateEach kilogram of rice needs 2,500 litres and the harvest is 1.2 tonnes. What is the water footprint in litres and cubic metres?
- IntermediateLocal output is 90,000 tonnes against demand of 300,000. What is the self-sufficiency rate, and which two routes raise it?
- IntermediatePaddy fields emit 3.5 tonnes of carbon dioxide equivalent per hectare over 150 hectares. What is the total, and how much is cut by 30 per cent?
- ChallengeIrrigation is only 55 per cent efficient, so what share of water is lost, and how much must be drawn for 150 hectares needing 8,000 cubic metres each?
- ChallengeCrop rotation cuts fertiliser 40 per cent from 300 kilograms per hectare while yield falls only 8 per cent from 5.0 tonnes. What are the new figures, and what happens to fertiliser per tonne?
- Error redoA student claims organic produce must be low carbon because it avoids fertiliser. What is being ignored?
03 Answers and one-line notes
| # | Answer | One-line note |
|---|---|---|
| 1 | High-yielding varieties, chemical fertiliser and irrigation, which sharply raised rice yields in Asia. | The three work together, since the new varieties need fertiliser and reliable irrigation to yield more, and any one alone adds little. |
| 2 | 120 kilograms. | Two times 1,200 times 0.05 is 120 kilograms; food miles are weight times distance times the emission factor. |
| 3 | Total 24,000 kilograms, falling to 18,000, a cut of 6,000. | Three hundred times eighty is 24,000, and seventy-five per cent of that is 18,000, so the cut is 6,000 kilograms. |
| 4 | Conventional 360 tonnes against organic 288, a gap of 72. | Five times seventy-two is 360 and four times seventy-two is 288, leaving a gap of 72 tonnes. |
| 5 | 3,000,000 litres, or 3,000 cubic metres. | Twelve hundred kilograms times 2,500 litres is 3,000,000 litres, and a thousand litres to the cubic metre gives 3,000 cubic metres. |
| 6 | 30 per cent; either grow more locally or cut waste and demand. | Ninety thousand over three hundred thousand is 30 per cent, with local output as the numerator and total demand as the denominator. |
| 7 | Total 525 tonnes; a 30 per cent cut is 157.5 tonnes. | 3.5 times 150 is 525 tonnes, and thirty per cent of that is 157.5 tonnes. |
| 8 | 45 per cent lost; 2,181,818.18 cubic metres drawn. | A hundred less fifty-five leaves 45 per cent lost; the crop needs 1,200,000 cubic metres, and dividing by 0.55 gives 2,181,818.18. |
| 9 | Fertiliser 180 kilograms and yield 4.6 tonnes; fertiliser per tonne falls from 60 to about 39.13 kilograms. | Sixty per cent of 300 is 180 and ninety-two per cent of 5.0 is 4.6; dividing gives 180 over 4.6, about 39.13 kilograms per tonne against 60 before. |
| 10 | Transport: the same 2 tonnes emits 9,600 kilograms flown 8,000 kilometres against 320 by sea, a thirtyfold gap. | Air freight at 0.60 and sea at 0.02 per tonne-kilometre give 2 times 8,000 times 0.60, or 9,600, against 320, so organic is not automatically low carbon. |
04 What to do after marking
- After marking, redo only the wrong items and write down which step went wrong (formula, unit, or misread number).
- Repeat the same item two days later; move to the next paper only when both attempts are correct.
- Parents only need the answer and note columns; there is no need to explain every item.
Need a tutor for this chapter? Register hereTutor Registration →
Questions and answers are written originally by the TutorZone team and are not taken from any school, publisher or examination authority paper. Every value is checked by computer.