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O Level Geography Resources Sustainability Quiz

Free Exam-Derived Gemma 4 31B O Level Geography Resources Sustainability quiz with questions and answers for Singapore students. This page is rendered as a direct URL so the questions and answers can be discovered without pressing in-page buttons.

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O Level Geography From Real Exams Generated by Gemma 4 31B Updated 2026-06-03

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Questions

O-Level Geography Quiz - Resources Sustainability

Name: ____________________
Class: ____________________
Date: ____________________
Score: ________ / 80

Duration: 60 Minutes
Total Marks: 80 Marks

Instructions:

Answer all questions in the spaces provided.
Use a blue or black pen.
For data-based questions, refer to the provided figures (hypothetical) and cite specific values.
Ensure your explanations follow a clear cause-and-effect sequence.

Section A: Short Answer and Data Interpretation (Questions 1–10)

1. Define the term "sustainable development". (2)
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2. State one difference between an anthropocentric and an ecocentric view of the environment. (2)
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3. Identify one way in which the intensification of food production can lead to soil degradation. (2)
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4. [Refer to a hypothetical Fig 1 showing wheat yields in Canada from 1990 to 2020]. Describe the overall trend in wheat production in Canada over the period shown. (3)
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5. Explain why the use of high-yield variety (HYV) seeds often requires an increase in chemical fertilizer use. (3)
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6. Describe the process of eutrophication in a freshwater lake. (4)
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7. Explain how the provision of clean drinking water in a rural village can lead to an increase in the local labor productivity. (4)
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8. Suggest one method to reduce the runoff of fertilizers into nearby water bodies. (2)
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9. Explain the relationship between population growth and the demand for sustainable water management. (4)
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10. Identify two resources that are considered non-renewable and explain why they are unsustainable if used at current rates. (4)
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Section B: Structured Response (Questions 11–16)

11. Explain how the "Four National Taps" strategy ensures water sustainability for Singapore. (6)
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12. Describe how the use of pesticides in intensive farming can lead to bioaccumulation in the food chain. (6)
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13. Explain why food insecurity is more prevalent in regions experiencing frequent extreme weather events. (6)
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14. Compare the impacts of traditional farming and intensive farming on the environment. (6)
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15. Explain why the transition to renewable energy sources (e.g., solar, wind) is often slow in developing countries. (6)
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16. Discuss how urban farming can contribute to a city's food sustainability. (6)
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Section C: Extended Response/Evaluation (Questions 17–20)

17. 'The use of technology is the only way to achieve global food security.' To what extent do you agree with this statement? Support your answer with examples. (8)
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18. 'Climate change is the most significant cause of water scarcity in the 21st century.' How far would you agree? (8)
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19. Evaluate whether the economic benefits of intensive agriculture outweigh the environmental costs. (8)
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20. 'Eutrophication is the most serious impact of the intensification of food production.' To what extent do you consider this statement to be true? (8)
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Answers

Answer Key - Resources Sustainability Quiz

1. Definition of Sustainable Development

Development that meets the needs of the present without compromising the ability of future generations to meet their own needs. (2 marks)

2. Anthropocentric vs Ecocentric

Anthropocentric: Nature is a resource to be used for human benefit.
Ecocentric: Nature has intrinsic value regardless of its use to humans. (2 marks)

3. Intensification and Soil Degradation

Over-use of chemical fertilizers can lead to soil acidification or salinization, reducing soil fertility over time. (2 marks)

4. Trend Description (Hypothetical Fig 1)

Overall trend: Increasing/Decreasing/Fluctuating.
Evidence: Cite start value (e.g., 10m tonnes in 1990) and end value (e.g., 15m tonnes in 2020).
Rate: Mention if the increase was rapid or gradual. (3 marks)

5. HYV Seeds and Fertilizers

HYV seeds are bred for high productivity but are "nutrient-hungry".
They deplete soil nutrients faster than traditional varieties.
Therefore, chemical fertilizers are needed to maintain high yields. (3 marks)

6. Process of Eutrophication

Nutrient runoff (nitrates/phosphates) enters water body $\rightarrow$ Algal bloom (rapid growth of algae) $\rightarrow$ Algae block sunlight $\rightarrow$ Submerged plants die $\rightarrow$ Bacteria decompose plants and use up oxygen $\rightarrow$ Hypoxia/Anoxia $\rightarrow$ Fish and other aquatic life die. (4 marks)

7. Clean Water and Labor Productivity

Reliable clean water reduces waterborne diseases (e.g., cholera, dysentery).
Fewer sick days for workers $\rightarrow$ consistent labor supply.
Better health/nutrition $\rightarrow$ higher physical and mental capacity for work. (4 marks)

8. Reducing Runoff

Use of buffer strips (vegetation along water edges) to trap nutrients.
Precision farming/controlled application of fertilizers. (2 marks)

9. Population Growth and Water Management

Higher population $\rightarrow$ increased demand for domestic, industrial, and agricultural water.
Pressure on existing aquifers/rivers leads to depletion.
Necessitates sustainable management (e.g., desalination, recycling) to prevent water stress. (4 marks)

10. Non-renewable Resources

Example 1: Fossil fuels (Coal/Oil) - take millions of years to form; used faster than they regenerate.
Example 2: Minerals (Iron/Copper) - finite deposits in the crust; once extracted, they cannot be replaced. (4 marks)

11. Four National Taps (Singapore)

Local catchment: Collecting rainwater via drains/reservoirs.
Imported water: Agreements with Malaysia.
NEWater: High-grade reclaimed water (recycling).
Desalination: Converting seawater to fresh water.
Together, they diversify sources and reduce reliance on a single source, ensuring resilience. (6 marks)

12. Bioaccumulation

Pesticides (e.g., DDT) are non-biodegradable.
Absorbed by primary producers (plankton/plants).
Eaten by primary consumers (small fish) $\rightarrow$ concentration increases.
Eaten by apex predators (large fish/birds) $\rightarrow$ highest concentration.
Leads to toxicity or reproductive failure in top predators. (6 marks)

13. Extreme Weather and Food Insecurity

Droughts: Reduce crop yields, kill livestock, dry up irrigation sources.
Floods: Wash away topsoil, destroy harvests, cause crop diseases.
Unpredictable patterns: Disrupt planting/harvesting cycles.
Result: Local food shortages and price spikes. (6 marks)

14. Traditional vs Intensive Farming

Traditional: Lower yields, less chemical use, lower environmental pollution, but higher risk of famine.
Intensive: High yields, high chemical use, causes eutrophication/soil degradation, but ensures food supply for growing populations. (6 marks)

15. Renewable Energy in Developing Countries

High initial capital cost for infrastructure (solar farms/wind turbines).
Lack of technical expertise for maintenance.
Reliance on existing cheap fossil fuel infrastructure.
Political instability or lack of government subsidies. (6 marks)

16. Urban Farming

Reduces "food miles" (transport distance) $\rightarrow$ lower carbon footprint.
Uses vertical space (hydroponics/aeroponics) $\rightarrow$ land efficiency.
Provides fresh produce to urban populations, reducing reliance on imports. (6 marks)

17. Technology and Food Security (Evaluation)

Agree: Precision farming, GMOs (pest resistance), vertical farming increase yields and resilience.
Disagree: Technology is expensive (inequity); doesn't solve political conflict or poverty; can cause environmental harm.
Conclusion: Technology is a critical tool but must be paired with fair distribution and sustainable policies. (8 marks)

18. Climate Change and Water Scarcity (Evaluation)

Agree: Altered rainfall patterns $\rightarrow$ prolonged droughts; melting glaciers $\rightarrow$ loss of long-term water storage.
Disagree: Over-extraction for agriculture; poor governance/infrastructure; population growth.
Conclusion: Climate change exacerbates scarcity, but human mismanagement is often the primary driver. (8 marks)

19. Economic Benefits vs Environmental Costs (Evaluation)

Benefits: Lower food prices, higher national income, employment, food security.
Costs: Loss of biodiversity, water pollution (eutrophication), soil degradation, greenhouse gas emissions.
Conclusion: Short-term economic gains are high, but long-term environmental costs may undermine the very productivity the system relies on. (8 marks)

20. Eutrophication as Most Serious Impact (Evaluation)

Agree: Creates "dead zones," destroys fisheries, affects drinking water quality, hard to reverse once systemic.
Disagree: Soil erosion/desertification is more permanent; pesticide bioaccumulation affects entire ecosystems; loss of biodiversity is irreversible.
Conclusion: Eutrophication is severe and widespread, but "most serious" depends on whether one values water quality over soil fertility or biodiversity. (8 marks)