HCI_H1_GEO_ANSWERS

2018 C2 Prelims H1 Geography ANSWERS Section A Theme 3 : Geographical Investigation 1 Resource 1 shows a relief map of Thomson Road and the surrounding area. Resource 2 shows part of the recording sheet used in the investigation. Resource 3 shows an image from Google Earth. Resource 4 shows an image of land use along Lorong 3 Tao Payoh. (a) Suggest a suitable hypothesis for the group investigation and explain why the hypothesis is clearly defined and at a suitable scale. [4] Example of hypothesis: A steeper slope will have a lower infiltration rate Independent variable: slope angle Dependent variable: infiltration rate Suitable scale: • Area is small enough for the group to conduct their study as they can split into 3 groups of about 7 students each (b) Select two areas A, B or C outlined in Resource 1 and suggest why the group might have chosen those areas for their comparative study. [4] • Areas B and C • Area B has high relief (50m) and low relief (11m) and would be good to study the effect of steep slopes • Area C has relative flat and low relief (about 18 – 20m) and would be useful to study the effect of gentle relief • Area C is also where a housing area is located and the effect of land use can be analysed as well (c) Draw a sketch of a graph to show how the data on infiltration rate for slope sections B1 bad B2 in Resource 2 can be represented and explain its advantages. [6] • A Line graph can be constructed with time from start and infiltration rate as the two axes • The line graph is a clear representation of the relationship between time and infiltration rate and easy to understand. The lines can be coloured to show the contrast between them. • Comparisons between the graphs can be made and analysed (d) Evaluate the usefulness of the data shown in Resource 3 in the investigation. [4] • Reflects nature of surface o Built-up areas o Vegetation cover o Roads • Shows elevation and angle of slope However,

2 • Points to locate the specific spots on the map and link to the cross-section are not sufficient. Hence, it is difficult to link the cross-section and the map (e) With reference to Resource 4, discuss how data on the effect of land use on floodrisk shown in Area C in Resource 1 can be collected. [7] • Area C is a housing area • Use of a map to record information on o Roads o Vegetation o Paths o Drainage o Buildings • Survey residents regarding the occurrence of floods both small and large scale in the area. • Measure the infiltration rate of different surfaces Include how the students should conduct themselves as they collect data • Not to