O Level Geography Practice Paper 3

Answer Key & Marking Scheme - Geography O-Level Practice Paper (V3)

SECTION 1

Question 1: Geographical Methods

(a) Hypothesis: (2m)

• Any logical hypothesis linking location to perception.
• Example: "Locations with more heritage architecture will have a more positive sense of place than locations with modern commercial buildings."

(b) Data Representation: (3m)

• Suggestion: A grouped bar chart or a radar chart. (1m)
• Justification: Allows for direct comparison of different perception categories across the five locations on a single set of axes. (2m)

(c) Calculation: (4m)

• Assign numerical values to the bipolar scale (e.g., Very Positive = +2, Positive = +1, Neutral = 0, Negative = -1, Very Negative = -2). (2m)
• Multiply the frequency of each response by its weight and sum them to find the net score. (2m)

(d) Reliability Evaluation: (5m)

• Position: Partially reliable / Unreliable. (1m)
• Evidence: Sample size of 15 is relatively small and may not represent the entire population of visitors/residents. (2m)
• Qualification: However, if stratified sampling was used, it may be more representative than random sampling. (2m)

(e) Photograph Support: (6m)

• Photographs provide visual evidence of the features that caused the perception (e.g., a photo of a dilapidated building supports a "negative" score for aesthetics). (3m)
• Allows for qualitative analysis (e.g., identifying specific architectural styles) that a numerical survey cannot capture. (3m)

Question 2: Tourism

(a) Pull Factors: (2m)

• Unique biodiversity/wildlife; pristine natural landscapes; cultural authenticity. (Any 2)

(b) Multiplier Effect: (5m)

• Direct spending: Tourists spend on eco-lodges/guides. (1m)
• Indirect spending: Lodges buy local organic produce from farmers. (2m)
• Induced spending: Local farmers spend their increased income at local markets. (2m)

(c) Evaluation (Quotas): (8m)

• Agree: Prevents overcrowding (overtourism), protects fragile ecosystems from degradation, maintains quality of experience. (3m)
• Disagree/Qualify: May reduce total economic revenue; does not stop "leakage" if hotels are foreign-owned; doesn't address the behavior of tourists. (3m)
• Conclusion: Effective for environmental protection, but must be paired with sustainable management to ensure economic viability. (2m)

Question 3: Climate

(a) Distinction: (4m)

• Mitigation: Addressing the cause of climate change (e.g., reducing $\text{CO}_2$ emissions via solar power). (2m)
• Adaptation: Adjusting to the impacts of climate change (e.g., building sea walls for rising sea levels). (2m)

(b) Methane Mechanism: (5m)

• Methane is a potent greenhouse gas. (1m)
• It absorbs long-wave infrared radiation emitted from Earth's surface. (2m)
• It re-radiates this heat back towards the surface, trapping more heat in the troposphere. (2m)

(c) Evaluation (Food Shortage): (6m)

• Agree: Droughts/floods destroy crops; shifting climate zones make traditional farming impossible. (2m)
• Disagree: Population growth exceeds production; political conflict/war disrupts supply chains; poverty prevents access to food. (2m)
• Conclusion: Significant factor, but interacts with socio-economic variables. (2m)

SECTION 2

Question 4: Thinking Geographically

(a) Memories & Sense of Place: (4m)

• Personal experiences (e.g., childhood play) create emotional bonds. (2m)
• These memories transform a physical space into a "place" with meaning and identity. (2m)

(b) Value Orientations: (4m)

• Anthropocentric: Nature exists to serve human needs/economic gain. (2m)
• Ecocentric: Nature has intrinsic value regardless of its utility to humans. (2m)

(c) Trade-offs: (7m)

• Economic: Job creation, GDP growth, infrastructure development. (2m)
• Environmental: Habitat loss (mangroves), pollution of coastal waters, loss of biodiversity. (2m)
• Evaluation: Short-term economic gain vs long-term ecological collapse. (3m)

Question 5: Tectonics

(a) Convergent Boundary: (6m)

• Diagram: Label oceanic plate, continental plate, subduction zone, trench, magma chamber, volcano. (3m)
• Process: Denser oceanic plate sinks $\rightarrow$ melts due to heat/friction $\rightarrow$ magma rises $\rightarrow$ volcanic eruption. (3m)

(b) Vulnerability: (5m)

• Building codes: Poor construction in developing nations leads to more collapses. (2m)
• Governance: Slower emergency response and lack of disaster preparedness. (2m)
• Poverty: Lack of insurance and resources for rapid rebuilding. (1m)

(c) Instruments: (4m)

• Magnitude: Richter Scale / Moment Magnitude Scale. (2m)
• Difference: Magnitude measures total energy released; seismographs measure the amplitude of waves over time. (2m)

Question 6: Singapore

(a) Four National Taps: (6m)

• Diversification: Reduces reliance on imported water. (2m)
• NEWater/Desalination: Provides weather-independent, sustainable sources. (2m)
• Local Catchment: Maximizes every drop of rain. (2m)

(b) Land Reclamation: (4m)

• Process: Filling in coastal areas with sand/rock to create new land. (2m)
• Purpose: Expanding industrial zones (e.g., Jurong Island) or residential areas. (2m)

(c) Evaluation (Underground Caverns): (10m)

• Agree: Extremely efficient for land-scarce cities; protects infrastructure from surface weather; allows high-density surface use. (4m)
• Disagree: High construction costs; engineering challenges (rock stability); psychological impact of underground spaces. (4m)
• Conclusion: Highly effective for specific utilities (water/storage) but not a total replacement for surface land. (2m)