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9.3 Material cycles and decomposition

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Question 7
F

Some countries have very little rainfall. Potable water can be produced from seawater by desalination.

The Figure shows apparatus that can be used for desalination in a laboratory.

Figure

image

a.

Explain how this apparatus produces potable water from seawater.

[3]
b.

Give one reason why desalination is only used to produce potable water in some countries.

[1]
c.

A desalination plant produces 45 000 m345\,000\ \text{m}^345000 m3 of potable water each day.

Each person in a town needs 0.15 m3 of potable water each day.

Calculate the number of people that the desalination plant can supply with potable water.

[2]
Markscheme

9.3 Material cycles and decomposition Questions

  1. GCSE
  2. /Biology
  3. /9.3 Material cycles and decomposition

44 exam-style questions on Edexcel GCSE Biology 9.3 Material cycles and decomposition, covering 9.3.1 Cycling of materials through ecosystems, 9.3.2 The carbon cycle, 9.3.3 The water cycle, 9.3.4 The nitrogen cycle, 9.3.5 Indicator species and pollution, 9.3.6 Decomposition in preservation and composting, and 9.3.7 Rate changes in decay of biological material. Each one has a worked solution and a mark scheme showing where the marks go.

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