Eutrophication

An increase in the amount of nutrients in a lake is known as

• calcification

• cellular respiration

• eutrophication

• photosynthesis

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The green plants on the surface of the lake turned out the be algae! There is a sudden increase in the rate of growth of the algae. What would happen next?

• The algae continue to grow due to excess nutrients, and some of the algae die

• The algae would stop growing

• The algae are not affected by the fertilisers

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Do not forget! There are aquatic plants under the lake too! What do you think the algae would do to the plants at the bottom of the lake?

• The aquatic plants will not be affected by the algae

• Sunlight cannot reach the bottom of the lake because the surface is covered in algae

• Sunlight can reach the bottom pf the lake. There is no problem.

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The size of hypoxic/dead zones will ________ with more nitrogen run-off.

• Increase

• Stay the same

• Decrease

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In a dead zone, _________ levels are really low such that living organisms are not able survive.

• nitrogen

• oxygen

• fertilizer

• carbon dioxide

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Why do nitrates and phosphates cause algal blooms?

• They are critical plant nutrients.

• They kill off competition.

• Because algae grow faster than decomposers.

• Nitrates and phosphates are density independent limiting factors.

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Which of the following is NOT a source of nitrates and phosphates into a river?

• Fertilizers

• Animal waste

• Sewage/

  Wastewater

• Burning fossil fuels

The long term effects of a hypoxic/dead zone includes all of the following except for

• Fisherman may struggle to catch any fish.

• The crops of farmers stop growing.

• The health of the fish population declines.

• There is an increase in the population of decomposers such as bacteria.

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Based on the diagram, which fish species is in a breeding zone with higher oxygen levels?

• Fish Species 1

• Fish Species 2

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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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