The newest 15 of 15 written questions. Open one to see it on the real paper.
Suggest two ways this water supply could be contaminated.
See it on the paper →State one source of nitrate ions in a river.
See it on the paper →Use the diagram to describe how human sewage enters oceans. (i)
See it on the paper →Suggest a source of high levels of salt in ground water.
See it on the paper →Statements A to G describe the process of eutrophication. The statements are not in the correct order. A algae and aquatic plants die B decomposers use up oxygen C excess fertiliser runs off into rivers D fish and other organisms die E nutrient enrichment causes algal bloom F overuse of fertiliser G sunlight blocked re...
See it on the paper →the table by calculating the total estimated mass of oil.
See it on the paper →the percentage of oil that enters the marine environment from the sea bed.
See it on the paper →one reason why the mass of oil is estimated.
See it on the paper →Generally, a well-answered question with the most common correct answer being about fertilisers.
— Examiner report, February/March 2025, 0680/22 Q2(c)(iii) (Cambridge)
Most responses suggested the sea or ocean as the main source of high levels of salt in ground water.
— Examiner report, October/November 2022, 0680/23 Q1(c)(iv) (Cambridge)
Eutrophication was clearly a familiar topic to most candidates and the majority of responses achieved some of the credit available.
— Examiner report, October/November 2021, 0680/11 Q1(a) (Cambridge)
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the data from the table to complete the bar chart of the sources of marine oil pollution. Label both axes.
the data in the table to complete the pie chart and key.
See it on the paper →The student also investigates the different types of plastic waste at the nearest beach to the capital city. The student: • collects samples of plastic waste in large boxes • sorts the contents of each box into different types of plastic waste • counts the number of each type of plastic waste in each box • takes an ave...
See it on the paper →Insecticides used on agricultural land can be washed into rivers. Describe the effects of insecticides on aquatic life in rivers.
See it on the paper →State one way that water can become contaminated with an infectious bacterial disease.
See it on the paper →A large build-up of algae is sometimes referred to as an algal bloom. Describe how algal blooms form.
See it on the paper →Suggest two reasons why the water may be unsafe to drink.
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