Year 10 Aquatic Practices Freshwater Ecosystems Quiz

What is the definition of a freshwater ecosystem?

• An ecosystem with water that has high salinity

• An ecosystem consisting of habitats with water containing less than 1% salinity

• An ecosystem that contains both freshwater and saltwater

• An ecosystem found only in coastal areas

What role do freshwater ecosystems play in regulating the climate?

• They absorb large amounts of carbon dioxide

• They provide habitats for terrestrial animals

• They filter out salt from seawater

• They store carbon and help regulate the climate

What percentage of the Earth's surface is covered by freshwater ecosystems?

• 10%

• 1%

• 0.8%

• 5%

Which of the following is a characteristic of rivers and streams in Australia?

• They are always seasonal and dry up in the summer

• They include both ephemeral (seasonal) and perennial (year-round) rivers

• They are only found in coastal regions

• They do not vary in speed or flow

What is the primary function of wetlands like those found in Kakadu National Park?

• To provide a source of drinking water

• To act as breeding grounds and filter water

• To store salt for later use

• To provide recreational spaces for humans

What process in freshwater ecosystems helps to remove pollutants from water?

• Evaporation

• Decomposition

• Water filtration by wetlands and riparian zones

• Photosynthesis

Which of the following is a common type of submerged plant found in Australian freshwater ecosystems?

• Reeds

• Duckweed

• Eelgrass

• Mangroves

Which fish species is native to Australia and is important for the country’s inland rivers?

• Barramundi

• Murray Cod

• Golden Perch

• All of the above

What is a significant threat to freshwater ecosystems in Australia caused by agricultural practices?

• Over-extraction of water

• Invasive species

• Pollution from agricultural runoff (fertilizers and pesticides)

• Changes in temperature

What is the purpose of the Ramsar Convention, and how does it relate to freshwater ecosystems?

• To regulate fishing in freshwater ecosystems

• To designate wetlands of international importance for conservation

• To ensure water is used equally across all regions

• To promote recreational fishing in lakes and rivers