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

SA2 Practice Paper — Geography Secondary 1

Answer Key (Version 3 of 5)

Section A: Map Skills

1. [1 mark]

• Accept any reasonable 4-figure grid reference based on the practice map provided (e.g., 4226).
• Marking note: Award 1 mark for a correct 4-figure grid reference. Easting (horizontal) must come first, then northing (vertical). Accept only the exact reference shown on the map used.

2. [1 mark]

• Accept any reasonable 6-figure grid reference for the mosque (e.g., 437254).
• Marking note: Award 1 mark for a correct 6-figure grid reference. The first two digits = easting, next two = northing, final two = estimated tenths. Common error: students reverse easting and northing.

3. [1 mark]

• Accept the correct compass direction (e.g., Northwest or South-southeast depending on map).
• Marking note: Award 1 mark for the correct 8-point or 16-point compass direction. Accept both "NW" and "northwest".

4. (a) [2 marks]

• Working:
  • Map distance = 10.6 cm
  • Scale: 1 cm = 50,000 cm = 0.5 km
  • Actual distance = 10.6 × 0.5 = 5.3 km
• Answer: 5.3 km
• Marking note: Award 1 mark for correct method (multiplying map distance by scale), 1 mark for correct answer with unit. Accept 5.3 km or 5.30 km.

(b) [2 marks]

• Working:
  • Trail distance on map = 14.2 cm
  • Actual trail distance = 14.2 × 0.5 = 7.1 km
• Answer: 7.1 km
• Marking note: Award 1 mark for correct method, 1 mark for correct answer with unit. Common error: students use the straight-line distance instead of the trail distance.

5. (a) [1 mark]

• Accept the correct highest possible altitude based on contour lines (e.g., less than 45 m if the highest contour shown is 40 m and the next interval is 5 m).
• Marking note: The highest possible altitude is just below the next contour line. If the highest visible contour is 40 m and the interval is 5 m, accept "between 40 m and 45 m" or "less than 45 m".

(b) [2 marks]

• Answer: The land rises to form a hill. The contour lines are closely spaced on the western side (steep slope) and widely spaced on the eastern side (gentle slope). The highest point is approximately 40–45 m above sea level.
• Marking note: Award 1 mark for identifying a hill/high ground, 1 mark for describing the slope variation (steep vs. gentle) or the shape of the contours. Accept any reasonable description consistent with the map.

6. (a) [1 mark]

• Accept any valid human feature (e.g., road, building, jetty, school, mosque, bridge).
• Marking note: Must be a human-made feature visible in the stated grid square.

(b) [1 mark]

• Accept any valid physical/natural feature (e.g., river, forest, mangrove, coastline, marsh, hill).
• Marking note: Must be a natural feature visible in the stated grid square.

(c) [1 mark]

• Accept any valid map evidence (e.g., presence of fields/orchards, agricultural symbols, open land with grid patterns, irrigation channels).
• Marking note: Award 1 mark for a specific piece of map evidence, not a general statement. "There are fields" is acceptable; "it looks green" is not.

Section B: Graph and Data Interpretation

7. (a) [1 mark]

• Answer: January

(b) [2 marks]

• Working: 280 + 195 + 210 + 245 + 175 + 160 = 1,265 mm
• Answer: 1,265 mm
• Marking note: Award 1 mark for correct addition process, 1 mark for correct total with unit.

(c) [2 marks]

• Working: Mean = 1,265 ÷ 6 = 210.8 mm (or 210.83 mm)
• Answer: 210.8 mm (accept 210.83 mm or 211 mm to nearest whole number)
• Marking note: Award 1 mark for dividing total by 6, 1 mark for correct answer. Accept rounding to 1 decimal place or nearest whole number.

8. (a) [2 marks]

• Working: Range = Highest − Lowest = 33 − 27 = 6°C
• Answer: 6°C
• Marking note: Award 1 mark for identifying highest and lowest values, 1 mark for correct answer with unit.

(b) [1 mark]

• Working: Coolest day = Sunday (27°C). 27 + 5 = 32°C → Thursday.
• Answer: Thursday

(c) [1 mark]

• Accept any reasonable reason (e.g., cloud cover, rainfall, wind direction, amount of sunshine).
• Marking note: Award 1 mark for a plausible meteorological reason. "Weather changed" is too vague — accept only specific factors.

9. (a) [1 mark]

• Working: 40% + 15% = 55%
• Answer: 55%

(b) [2 marks]

• Working: 20% of 200 km² = 0.20 × 200 = 40 km²
• Answer: 40 km²
• Marking note: Award 1 mark for correct method (finding 20% of 200), 1 mark for correct answer with unit.

(c) [1 mark]

• Accept any valid advantage (e.g., provides recreation space, reduces urban heat island effect, improves air quality, supports biodiversity, reduces flooding by absorbing rainwater).
• Marking note: Award 1 mark for a clear, specific advantage. "It is nice" is not acceptable.

10. (a) [1 mark]

• Working: Ordered: 38,000; 45,000; 55,000; 62,000; 70,000. Median = 3rd value.
• Answer: Town D

(b) [1 mark]

• Working: 45,000 + 62,000 + 38,000 + 55,000 + 70,000 = 270,000
• Answer: 270,000

(c) [2 marks]

• Working: 10% of 70,000 = 7,000. New population = 70,000 + 7,000 = 77,000
• Answer: 77,000
• Marking note: Award 1 mark for calculating 10% of 70,000, 1 mark for adding to original population. Accept 77,000 only.

11. (a) [1 mark]

• Answer: Under a tree (28°C)

(b) [2 marks]

• Answer: Concrete absorbs and retains heat more than grass. Concrete has a lower albedo (reflects less sunlight) and stores thermal energy, causing the surface temperature to rise higher. Grass, on the other hand, reflects more sunlight and loses heat through evapotranspiration.
• Marking note: Award 1 mark for stating that concrete absorbs/retains more heat, 1 mark for mentioning evapotranspiration or albedo difference. Accept equivalent phrasing.

(c) [1 mark]

• Answer: The tree provides shade, blocking direct sunlight from reaching the ground. Additionally, trees release water vapour through transpiration, which cools the surrounding air.
• Marking note: Award 1 mark for shade or transpiration as the reason. Both are acceptable.

12. (a) [1 mark]

• Answer: The water quality decreases (WQI readings decline) from Point P to Point S as one moves downstream.

(b) [1 mark]

• Accept any valid reason (e.g., discharge of sewage/effluent, runoff from farms carrying fertilisers, industrial waste discharge, dumping of rubbish).
• Marking note: Award 1 mark for a specific pollution source. "Pollution" alone is too vague.

(c) [2 marks]

• Answer: Point P has the best water quality (WQI = 85). This suggests that there are few or no pollution sources upstream of Point P, and the area is relatively undeveloped or well-managed.
• Marking note: Award 1 mark for identifying Point P, 1 mark for explaining that the area upstream has minimal human activity/pollution.

13. (a) [2 marks]

• Working: Highest temperature = 29°C (May/Jun); Lowest = 26°C (Jan/Feb/Dec). Range = 29 − 26 = 3°C
• Answer: 3°C
• Marking note: Award 1 mark for identifying highest and lowest values, 1 mark for correct calculation and unit.

(b) [1 mark]

• Answer: June to September (mid-year months) — accept any reasonable range within this period.
• Marking note: Accept "June to September" or "mid-year" or "around June–August". The key is identifying the wetter period.

(c) [2 marks]

• Answer: From January to June, both temperature and rainfall increase together. As the temperature rises from 26°C to 29°C, the rainfall increases from 60 mm to 210 mm. This shows a positive correlation between temperature and rainfall during this period.
• Marking note: Award 1 mark for describing the trend (both increase), 1 mark for stating the relationship (positive correlation) or providing supporting data from the table.

14. (a) [1 mark]

• Working: 3 symbols × 500 = 1,500 visitors
• Answer: 1,500 visitors

(b) [2 marks]

• Working: Reserve Z = 8 × 500 = 4,000; Reserve Y = 3 × 500 = 1,500. Difference = 4,000 − 1,500 = 2,500 visitors
• Answer: 2,500 visitors
• Marking note: Award 1 mark for correct values for both reserves, 1 mark for correct difference.

(c) [1 mark]

• Accept any valid reason (e.g., better accessibility by public transport, more facilities/attractions, better marketing/promotion, larger size, located near residential areas).
• Marking note: Award 1 mark for a plausible, specific reason.

Section C: Data Response and Application

15. (a) [1 mark]

• Answer: 2020 (450 million gallons/day)

(b) [2 marks]

• Working: Increase = 450 − 430 = 20. Percentage increase = (20 ÷ 430) × 100 = 4.65% (accept 4.6% or 4.7%)
• Answer: 4.65%
• Marking note: Award 1 mark for correct method (finding difference and dividing by original), 1 mark for correct answer. Accept answers between 4.6% and 4.7%.

(c) [1 mark]

• Accept any valid reason (e.g., more people stayed home during the COVID-19 pandemic, increased handwashing and hygiene practices, more home cooking).
• Marking note: Award 1 mark for a specific, plausible reason linked to 2020 context.

16. (a) [1 mark]

• Answer: Friday (1,410 vehicles)

(b) [2 marks]

• Working: Total = 1,250 + 1,180 + 1,320 + 1,290 + 1,410 = 6,450. Mean = 6,450 ÷ 5 = 1,290 vehicles/day
• Answer: 1,290 vehicles per day
• Marking note: Award 1 mark for correct total, 1 mark for correct division and answer.

(c) [2 marks]

• Answer: The data supports the student's claim for this particular week, as Friday had the highest traffic volume (1,410 vehicles). However, the claim uses the word "always," which is too absolute. This is only one week's data, and traffic patterns may vary on other weeks due to holidays, events, or road closures. A conclusion about "always" would require data collected over a longer period.
• Marking note: Award 1 mark for acknowledging that Friday had the highest traffic in this data set, 1 mark for evaluating the limitation (only one week's data / "always" is too absolute). Accept any reasonable evaluation.

17. (a) [2 marks]

• Answer: There is a negative/inverse relationship between distance from the city centre and average household income. As the distance from the city centre increases, the average household income decreases. For example, at 2 km the income is $8,500, while at 12 km it drops to$5,200.
• Marking note: Award 1 mark for identifying the negative/inverse relationship, 1 mark for supporting the description with data from the table.

(b) [1 mark]

• Answer: Approximately **$6,850** (accept any value between$6,500 and $7,200, as 7 km falls between 6 km and 8 km).
• Marking note: Award 1 mark for a reasonable estimate within the range.

(c) [1 mark]

• Accept any valid reason (e.g., land is cheaper further from the city centre, so lower-income families can afford housing there; higher-income workers prefer to live near the city centre for convenience; the city centre has more high-paying jobs nearby).
• Marking note: Award 1 mark for a plausible socio-economic reason.

18. (a) [2 marks]

• Working: Total = 4.2 + 5.8 + 6.5 + 5.1 + 3.9 = 25.5. Mean = 25.5 ÷ 5 = 5.1 m
• Answer: 5.1 m
• Marking note: Award 1 mark for correct total, 1 mark for correct division and answer with unit.

(b) [2 marks]

• Answer: Point 5 (3.9 m) is the narrowest. One possible reason: the river banks at Point 5 may be closer together due to natural rock formations, human construction (such as a bridge or embankment), or erosion patterns that cause the channel to narrow at that point.
• Marking note: Award 1 mark for identifying Point 5, 1 mark for a reasonable explanation of why the river is narrower there.

19. (a) [1 mark]

• Answer: Paper waste decreased from 25% in 2019 to 18% in 2022, showing a steady/consistent downward trend over the four years.

(b) [1 mark]

• Answer: Plastic waste (increased from 30% to 34%) and food waste (increased from 35% to 38%) both showed increasing trends. Accept either.
• Marking note: Award 1 mark for identifying plastic or food waste with the increasing trend.

(c) [1 mark]

• Accept any valid reason (e.g., increased use of digital devices/less printing, more recycling of paper, shift to paperless offices/schools, government campaigns to reduce paper use).
• Marking note: Award 1 mark for a specific, plausible reason.

(d) [2 marks]

• Working: Plastic waste in 2022 = 34% of 1,000 tonnes = 0.34 × 1,000 = 340 tonnes
• Answer: 340 tonnes
• Marking note: Award 1 mark for correct method (finding 34% of 1,000), 1 mark for correct answer with unit.

20. (a) [2 marks]

• Answer: Neighbourhood A is more accessible. Evidence: (1) It is only 0.3 km from the nearest MRT station compared to 1.5 km for Neighbourhood B. (2) It has 8 bus routes compared to only 3 in Neighbourhood B.
• Marking note: Award 1 mark for identifying Neighbourhood A, 1 mark for providing two pieces of evidence from the table. Both pieces of evidence must be stated for the second mark.

(b) [1 mark]

• Accept any valid reason (e.g., Neighbourhood A is closer to the MRT station, has better transport links, is closer to the park, and has higher demand due to its convenient location).
• Marking note: Award 1 mark for a clear reason linked to the data in the table.

(c) [2 marks]

• Answer: I would recommend Neighbourhood B. Although it is further from the park (2.0 km vs. 0.5 km), the average flat price is significantly lower ($380,000 vs.$520,000), making it more affordable for the young couple. The couple could use the savings to own a car or take public transport to the park. Alternatively, accept Neighbourhood A with justification that it is very close to a park and the couple may prioritise proximity over cost.
• Marking note: Award 1 mark for stating a recommendation (either neighbourhood is acceptable if justified), 1 mark for using data from the table to support the recommendation. The justification must reference specific figures from the table.

Mark Summary