Eutrophication: Causes and Effects in Aquatic Systems

Eutrophication occurs when excess nutrients, often from fertilizers, enter water bodies, leading to rapid algae growth. This algal bloom blocks sunlight, killing plants. As algae die, bacteria decompose them, consuming oxygen and creating anoxic conditions, which can kill aquatic life. Careful fertilizer use is crucial to prevent this cycle.

What is eutrophication?

• A process where water bodies freeze over.

• A process where water bodies become acidic.

• A process where water bodies lose all their nutrients.

• A process where too many nutrients are added to a water body.

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Which nutrients are primarily responsible for eutrophication?

• Calcium and magnesium

• Nitrate and phosphate

• Potassium and sodium

• Iron and zinc

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What is the initial effect of increased nutrients in water?

• Decrease in water temperature

• Reduction in water clarity

• Formation of algal blooms

• Increase in fish population

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What happens to aquatic plants during an algal bloom?

• They grow faster

• They die due to lack of sunlight

• They become more colorful

• They start producing more oxygen

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What happens to algae when they consume all the nutrients?

• They turn into bacteria

• They grow even faster

• They become toxic

• They start to die

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What role do bacteria play in the eutrophication cycle?

• They increase the water's oxygen levels

• They prevent algal blooms

• They break down dead plants and algae

• They produce more nutrients

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What is the term for water without oxygen?

• Anaerobic

• Anoxic

• Aerobic

• Hypoxic

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What happens to non-bacterial life in anoxic water?

• They migrate

• They thrive

• They become dormant

• They die

Why is it important to be careful with fertilizers when growing crops?

• They can reduce crop yield

• They can lead to eutrophication in nearby water bodies

• They can attract pests

• They can cause soil erosion

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