River Ecosystems Quiz

What is the main source of water for river ecosystems?

• Groundwater

• Precipitation

• Lakes

• Oceans

Which of the following is at the base of the river food chain?

• Small fish

• Zooplankton

• Aquatic insects

• Phytoplankton

What process do phytoplankton use to produce energy?

• Respiration

• Digestion

• Photosynthesis

• Evaporation

What do zooplankton feed on in river ecosystems?

• Small fish

• Aquatic plants

• Phytoplankton

• Insects

What role do fish play in a river food chain?

• Decomposers

• Primary consumers

• Tertiary consumers

• Producers

Why is oxygen release by phytoplankton important?

• Increases river water level

• Cools the river

• Supports aquatic life

• Prevents evaporation

Rivers flow from:

• Oceans to lakes

• Low to high areas

• High to low elevation

• Forests to mountains

Which of the following defines a river ecosystem?

• A water body without life

• A community of animals only

• Plants and animals interacting in a river

• A river used for transport only

What is a river source?

• Where the river ends

• A dam

• Where the river begins

• A tributary

Which organism is not part of a typical river ecosystem?

• Phytoplankton

• Zooplankton

• Sharks

• Aquatic insects