O-LevelBiologyEcology & Environment5090/22 · Oct/Nov 2015 · Q57 Marks

Fig. 5.1 shows some human activities that have an effect on the environment. [Figure 5.1]

(a)Name two gases, other than carbon dioxide, released at R that are harmful to the environment. For each gas, state the harm that it causes. gas 1 harm caused gas 2 harm caused[4]
(b)Explain how recycling could prevent the damage caused to the environment at S and T. at S at T[3]

This question uses a diagram from the original paper, which isn't shown here. Open the full paper from the past papers archive to see it.

Mark scheme

Marking points from the official mark scheme (Oct/Nov 2015). The mark or mark type is shown in brackets.

[max 4] any 2 from : oxides of sulfur ; acid rain; OR oxides of nitrogen; acid rain/greenhouse gas/ref. global warming; OR carbon monoxide; effect on O2 carriage by blood AW/greenhouse gas/ ref. global warming; breathing difficulties (related to any correct gas);
[max 3] (S) recycling of water AW ; sewage treatment/water treatment/use as fertliliser/use in an anaerobic digester ; reduce amount of pollutants entering water; prevention of disease/eutrophication/death of or harm to organisms; (T) recycling of paper/tree-based products; prevents deforestation; prevents named consequence of deforestation e.g. soil erosion, flooding; fewer harmful emissions/less air pollution ;

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