Freshwater Ecosystem Quiz

What percentage of the planet's water is fresh water?

• Less than 3%

• About 25%

• More than 50%

• Exactly 10%

Where does fresh water originate?

• From melting ice only

• From underground lava flows

• From evaporation of oceans, lakes, and other bodies of water

• Directly from rainfall only

What is the role of limnologists?

• They research urban development

• They focus on desert ecosystems

• They study freshwater ecosystems

• They study marine ecosystems

What causes water in lakes to churn and mix nutrients?

• Temperature changes between seasons

• Fish swimming patterns

• Boats and human activity

• Pollution levels

What is a significant threat to freshwater ecosystems?

• Air traffic

• Solar radiation

• Noise pollution

• Invasive species

What is the main consequence of the spiny water flea invasion in Lake Mendota?

• Increased algae growth and lower oxygen levels

• Decreased water temperatures

• Increased fish populations

• Improved water clarity

What is the primary source of fresh water in cities?

• Imported bottled water

• Groundwater from aquifers

• Direct rainfall

• Recycled wastewater

What adaptation do healthy freshwater ecosystems have?

• Resilience to changes and fluctuations

• Ability to generate freshwater

• Resistance to all pollutants

• Immunity to invasive species

What is the role of rivers and streams in freshwater ecosystems?

• Transporting nutrients from mountains to oceans

• Only providing habitats for fish

• Cooling the surrounding landscapes

• Generating hydroelectric power

What happens when the water table is reached in an aquifer?

• It causes earthquakes

• Wells are drilled to extract water

• The aquifer overflows to the surface

• It triggers volcanic eruptions