Eutrophication: 20 Questions

Eutrophication is caused by

• excess nutrients building up in the water.

• industrial point-source pollution.

• unlined landfills and septic tanks.

• wastewater from homes mixing with drinking water.

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How does eutrophication cause the death of aquatic organisms

• the build up of carbon dioxide in the water

• the lack of nitrogen in the water

• the lack of carbon dioxide in the water

• the lack of oxygen in the water

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The two critical nutrients in eutrophication are... (select two)

• nitrates

• phosphates

• carbon dioxide

• dissolved oxygen

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In eutrophication, dissolved oxygen levels decrease because

• bacteria use it as they decompose organic material

• algae uses it during photosynthesis

• it reacts with hydrogen to form H2O (water)

• fish use it up as they consume algae

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Which would most likely happen if too many nutrients entered an estuary?

• Nutrients would be used up by the fish and plants, keeping the estuary in balance.

• Algal blooms would lower dissolved oxygen levels, causing fish to suffocate.

• Algal blooms would decrease, leaving few food resources for fish.

• Nutrients would sink to the bottom, increasing soil deposition.

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Why should farmers be concerned about unused nitrate fertilizer contaminating surface water and groundwater supplies?

• Unused nitrates reduce algae growth.

• Unused nitrates increase oxygen in the water.

• Excessive amounts of nutrients cause overpopulation of fish.

• Excessive amounts of nutrients speed up the eutrophication process.

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Where is the most likely location of a dead zone in this watershed?

• A

• B

• C

• I

• H

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What can be a source of nitrates for eutrophication in rivers?

• fertilisers

• plastic bottles

• paper

• sewage

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What is the very next thing that happens after fertilisers enter a river in eutrophication?

• Fish die due to a lack of oxygen

• Plants below the surface die due to a lack of sunlight

• The number of aerobic bacteria increases

• Fast growth of plants

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In eutrophication, what directly causes the death of fish?

• The plants use up oxygen in respiration

• The fish are poisoned by high CO₂ levels

• Bacteria use up oxygen in respiration

• The fish use up oxygen in respiration

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