Answer: iii.
15. Answer: vi
Section B starts by mentioning the function of the desolenator: it can “take water from different places, such as the sea, rivers, boreholes and rain, and purify it for human consumption”. Thus, ‘the sea, rivers, boreholes and rain’ can be regarded as different sources of water which can be purified (cleaned) by the device. So the heading is vi – ‘Cleaning water from a range of sources’.
16. Answer: v
Section C explains how the device works. It starts by emphasizing that “unlike standard desalination techniques, it (the desolenator) doesn’t require a generated power supply: just sunlight”. This is considered the feature of the desolenator which makes it different from other alternatives. Thus, the heading is v – ‘What makes the device different from alternatives’.
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