Secondary 1 Geography Semestral Assessment 2 (End of Year) Paper 3

TuitionGoWhere Practice Paper - Geography Secondary 1 (Answer Key)

SA2 Version 3 - Marking Scheme

Section A: Map Skills and Data Interpretation [25 marks]

Question 1 [1 mark]

Answer: 2563

• Accept any reasonable 4-figure grid reference for Fort Siloso location
• Deduct 1 mark if 6-figure reference given instead

Question 2 [1 mark]

Answer: 10m / 10 metres

• Accept "10" if units are clear from context
• Do not accept other intervals without justification

Question 3 [2 marks]

Answer: 256638 (or similar 6-figure reference for highest point)

• 2 marks for correct 6-figure reference
• 1 mark for correct 4-figure reference (2563)
• 0 marks for incorrect grid reference

Question 4 [3 marks]

Sample Answer: The relief shows gently sloping terrain / low-lying land (1 mark). The area rises gradually from sea level to approximately 50-60 metres (1 mark). The contour lines are widely spaced, indicating gentle gradients / slopes (1 mark).

Mark Scheme:

• 1 mark for describing general relief character
• 1 mark for height reference with evidence
• 1 mark for gradient/slope description with evidence

Question 5 [2 marks]

Answer: Site A Evidence: Site A has the highest dissolved oxygen (8.4 mg/L) and lowest turbidity (12 NTU), indicating better water quality.

Mark Scheme:

• 1 mark for identifying Site A
• 1 mark for appropriate evidence from the data

Question 6 [3 marks]

Sample Answer: Water temperature increases from Site A to Site C (1 mark). Site A has the lowest temperature at 28.5°C while Site C has the highest at 30.2°C (1 mark). The temperature rises by 1.7°C across the three sites (1 mark).

Mark Scheme:

• 1 mark for identifying the trend (increasing)
• 1 mark for using specific data values
• 1 mark for quantifying the change

Question 7 [2 marks]

Sample Answer: Site C is located near Gardens by the Bay where there may be more human activities / construction work (1 mark), which increases the amount of suspended particles in the water, making it more turbid (1 mark).

Mark Scheme:

• 1 mark for identifying a relevant cause
• 1 mark for explaining the link to turbidity

Question 8 [3 marks]

Sample Answer: The conclusion is partially supported by the data (1 mark). Dissolved oxygen decreases from 8.4 mg/L at Site A to 6.9 mg/L at Site C, and turbidity increases from 12 NTU to 25 NTU (1 mark). However, pH levels show only a small decrease and temperature increases, which may not necessarily indicate poorer water quality (1 mark).

Mark Scheme:

• 1 mark for evaluation statement
• 1 mark for supporting evidence
• 1 mark for qualifying/limiting evidence

Question 9 [4 marks]

Sample Answer: Singapore's daily water consumption per person decreased from 165 litres in 2000 to 141 litres in 2020 (1 mark). This represents a reduction of 24 litres per person per day (1 mark). The decrease was most significant between 2000 and 2010, falling by approximately 20 litres (1 mark). From 2010 to 2020, the consumption continued to decline but at a slower rate (1 mark).

Mark Scheme:

• 1 mark for overall trend with data
• 1 mark for quantifying total change
• 1 mark for describing period of greatest change
• 1 mark for describing rate of change over time

Question 10 [4 marks]

Sample Answers:

• Reason 1: Government water conservation campaigns educated people about water saving, leading to more efficient water use habits (2 marks)
• Reason 2: Introduction of water-efficient appliances and technologies reduced household water consumption (2 marks)

Mark Scheme:

• 2 marks per reason for clear explanation
• 1 mark per reason for basic identification only

Section B: Water Resources and Management [20 marks]

Question 11 [3 marks]

Sample Answers:

• Way 1: Domestic use - Water is used for household activities such as showering, washing dishes, and cleaning
• Way 2: Drinking and cooking - Water is essential for human consumption and food preparation
• Way 3: Recreation - Water is used for swimming pools, water sports, and leisure activities

Mark Scheme:

• 1 mark per way, must include description not just identification
• Accept: domestic, recreational, personal hygiene, gardening

Question 12 [2 marks]

Sample Answer: Water is used for cooling equipment in factories and power plants (1 mark) because industrial processes generate heat that needs to be removed to prevent damage to machinery (1 mark).

Mark Scheme:

• 1 mark for identifying industrial use
• 1 mark for explaining the purpose/process

Question 13 [2 marks]

Answer: Renewable Explanation: Water is replenished naturally through the hydrological cycle processes such as evaporation, condensation, and precipitation.

Mark Scheme:

• 1 mark for correct classification
• 1 mark for explanation referencing hydrological cycle

Question 14 [4 marks]

Sample Answer: Agriculture dominates global water use, accounting for 70% of total consumption (1 mark). Industry is the second largest user at 20% (1 mark). Domestic use accounts for only 10% of global water consumption (1 mark). This pattern shows that food production requires significantly more water than other human activities (1 mark).

Mark Scheme:

• 1 mark per sector with correct percentage
• 1 mark for interpretation/explanation of pattern

Question 15 [5 marks]

Sample Answers:

• Strategy 1: NEWater - Recycled wastewater provides a sustainable water source (1 mark) by treating used water to potable standards, reducing dependence on imports and natural sources (1.5 marks)
• Strategy 2: Desalination - Converting seawater to freshwater (1 mark) provides a weather-independent water source that can meet growing demand sustainably (1.5 marks)

Mark Scheme:

• 1 mark for identifying each strategy
• 1.5 marks for explaining how each contributes to sustainability

Question 16 [4 marks]

Sample Answer: Strengths: Water conservation campaigns raise public awareness about water scarcity and encourage behavioral changes that reduce consumption (2 marks). Limitations: Campaigns rely on voluntary participation and may not achieve significant water savings if people do not change their habits permanently (2 marks).

Mark Scheme:

• 2 marks for explaining strengths
• 2 marks for explaining limitations

Section C: Coastal Environments and Sustainability [20 marks]

Question 17 [3 marks]

Sample Answer: Mangrove roots form dense networks that trap and stabilize loose sediments (1 mark). The trapped sediments accumulate over time, building up the coastal area (1 mark). The root systems also reduce wave energy and water flow, preventing erosion of the coastline (1 mark).

Mark Scheme:

• 1 mark for sediment trapping function
• 1 mark for sediment accumulation/deposition
• 1 mark for wave energy reduction

Question 18 [2 marks]

Sample Answer: Mangrove roots include aerial/prop roots that extend above water (1 mark) to absorb oxygen from the air since the waterlogged soil lacks oxygen (1 mark).

Mark Scheme:

• 1 mark for identifying aerial/prop root adaptation
• 1 mark for explaining the environmental challenge addressed

Question 19 [3 marks]

Sample Answer: Mangroves are found along Singapore's coastlines, particularly on the northern and western shores (1 mark). They are also present on offshore islands such as Pulau Ubin and around Chek Jawa (1 mark). The distribution follows sheltered coastal areas and river mouths where conditions are suitable for growth (1 mark).

Mark Scheme:

• 1 mark for coastal distribution
• 1 mark for island locations
• 1 mark for environmental pattern recognition

Question 20 [4 marks]

Sample Answer: Mangrove seedlings need calm water conditions to establish and take root (1 mark). Strong waves and currents in exposed areas would uproot young plants before they can develop (1 mark). Sheltered environments like river mouths provide protection from wave action (1 mark) and often have brackish water conditions that mangroves prefer (1 mark).

Mark Scheme:

• 1 mark for seedling establishment requirement
• 1 mark for explaining wave damage risk
• 1 mark for identifying shelter benefit
• 1 mark for additional environmental factor

Question 21 [4 marks]

Sample Answer: Strengths: Nature reserves provide legal protection that prevents development and human interference (1 mark), allowing mangrove ecosystems to function naturally and maintain biodiversity (1 mark). Limitations: Reserves require ongoing funding for management and monitoring (1 mark), and may not address external threats like pollution from surrounding areas (1 mark).

Mark Scheme:

• 2 marks for explaining strengths with examples
• 2 marks for explaining limitations with examples

Question 22 [4 marks]

Sample Answer: Environmental impacts: Loss of mangrove habitat would reduce biodiversity and eliminate coastal protection services (1 mark), increasing erosion risk and removing carbon storage capacity (1 mark). Economic impacts: Short-term economic benefits from the shopping mall development and job creation (1 mark), but long-term costs from increased coastal protection needs and loss of ecosystem services (1 mark).

Mark Scheme:

• 2 marks for environmental impacts with explanation
• 2 marks for economic impacts (both positive and negative aspects)

Total: 65 marks

Grade Boundaries (Suggested):

• A: 55-65 marks (85-100%)
• B: 46-54 marks (70-84%)
• C: 36-45 marks (55-69%)
• D: 26-35 marks (40-54%)
• F: Below 26 marks (<40%)