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The photograph shows a waste water pipe that empties into a river in Romania. One impact of waste water is nutrient enrichment and eutrophication in rivers. Suggest two other impacts. Voce eect A scientist investigates how the concentration of nitrate ions in water affects algal biomass. The table shows the results. ni...
See it on the paper →The women have collected water in containers. The containers are recycled cooking oil containers. Suggest one problem of using recycled cooking oil containers to carry drinking water. (a) The photograph shows women carrying drinking water.
See it on the paper →Explain why water from rivers and lakes may not be safe to drink.
See it on the paper →Scientists have found large amounts of mercury in the water along the coasts and in the rivers in Greenland. Mercury is a toxic substance. Suggest two reasons why people in Greenland are concerned about mercury in the water.
See it on the paper →Explain why sewage in water is a risk to humans. Section B
See it on the paper →Explain why sewage in water is a risk to humans. Section B
See it on the paper →Pilot whales contain hazardous levels of toxic chemicals in their bodies. Explain how toxic chemicals bioaccumulate in pilot whales.
See it on the paper →This was a well-answered question; many knew that sewage in water would result in diseases, and many gave the examples of cholera or typhoid. Some candidates incorrectly gave malaria as an example of a disease caused by sewage.
— Examiner report, May/June 2025, 0680/11 Q3(c) (Cambridge)
This was a well-answered question; many knew that sewage in water would result in diseases, and many gave the examples of cholera or typhoid. Some candidates incorrectly gave malaria as an example of a disease caused by sewage.
— Examiner report, May/June 2025, 0680/13 Q3(c) (Cambridge)
Most responses identified at least one aspect of there being toxic chemicals in the water, that they would be absorbed by lower organisms in the chain and then consumed in larger quantities by those at higher levels with a higher ingestion rate than egestion rate. The strongest candidates were able to give three of these aspects.
— Examiner report, May/June 2025, 0680/21 Q2(b)(iii) (Cambridge)
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Complete the sentences about the impacts of excess nitrate ions in a river. absorbed decomposed nitrogen carbon dioxide eutrophication oxygen sedimentation chlorination evaporated gases sunlight water Excess nitrate ions in a river cause algae to grow very quickly. The algae block from entering the river. Plants and al...
See it on the paper →Describe how human sewage can impact human health.
See it on the paper →How overuse of fertilisers can impact lakes and rivers.
See it on the paper →The maximum safe level of mercury in food and water is 20 arbitrary units. Suggest what the scientist advises local people about eating fish from the reservoir. Give a reason for your answer.
See it on the paper →Complete the boxes to show the correct order of statements for the process of eutrophication. One has been done for you. B
See it on the paper →Explain why a lack of oxygen leads to the death of aquatic organisms.
See it on the paper →Many people in rural areas of Africa have poor sanitation. Poor sanitation means drinking water is not safe and sewage is not treated. Suggest the impacts of poor sanitation.
See it on the paper →Drinking water directly from lakes or rivers can cause bacterial diseases such as cholera or typhoid. Describe two other risks to human health of drinking water directly from lakes or rivers.
See it on the paper →N The diagram shows the ground water quality in Spain. 0 100 200 km Key ground water quality good poor no data Describe the distribution of poor ground water quality in Spain.
See it on the paper →Fertilisers can kill aquatic life if the nutrients they contain run off into water sources. The nutrients increase the growth of algae. Eventually, the algae die. Explain how the death of algae leads to the death of other aquatic life.
See it on the paper →State the name of one other infectious bacterial disease that is caused by eating or drinking contaminated food or water.
See it on the paper →State two infectious bacterial diseases that could be in the water.
See it on the paper →The water table is the upper level of water within an aquifer. If too much water is removed from the Biscayne aquifer, the overall direction of water flow shown in the diagram can reverse. Use the diagram to explain why this is a problem.
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