Eutrophication quiz

What is the original cause of eutrophication?

• Too many predators

• Too many herbivores

• Excess fertilizer

• Too much oxygen

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Which describes a dead zone?

• An area of low oxygen in water

• A single point where water drains to

• Where fresh water and salt water meet

One of the primary human causes of dead zone formation is:

• Burning of fossil fuels

• Deforestation

• Overfishing

• Farming with fertilizers

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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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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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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 does 'algal bloom' refer to?

• The rapid increase in the number of bacteria

• The rapid increase in the number of plants

• The rapid decrease in the number of fish

• The rapid increase in the amount of nitrates in the river

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When algae levels increase in a body of water, it

• cuts off light to plants at the bottom.

• increases light to the plants on the bottom.

• causes dissolved Oxygen levels increase.

• causes bacteria populations decrease.

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Which nutrients are primarily responsible for eutrophication?

• Phosphorus and nitrogen

• Carbon and oxygen

• Hydrogen and helium

• Sulfur and potassium

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Hypoxia is a state of depleted oxygen in water.

• True

• False

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