Aquatic Ecosystems and Their Inhabitants

Streams and rivers are crucial to Earth's landscape, shaping environments and supporting life. Streams are small water flows that combine to form rivers, which transport water to larger bodies. They provide habitats for diverse species, from small insects in streams to larger fish and birds in rivers. Aquatic plants stabilize banks and prevent erosion. Streams and rivers also offer recreational opportunities, allowing people to connect with nature.

What is the primary force that causes streams to flow downhill?

• Tides

• Magnetism

• Gravity

• Wind

Which of the following is NOT a characteristic of rivers?

• They flow towards larger bodies of water.

• They are wider and deeper than streams.

• They are usually narrower than streams.

• They can span great distances across the land.

Which small creatures are commonly found in streams?

• Ducks

• Salmon

• Frogs

• Mayflies

What type of fish is commonly found in streams?

• Salmon

• Trout

• Catfish

• Bass

Which organisms begin to thrive as streams transition into rivers?

• Salmon

• Mayflies

• Stoneflies

• Caddisflies

Which bird is commonly seen feeding in river ecosystems?

• Owl

• Kingfisher

• Eagle

• Sparrow

Which aquatic plant can be found floating on the surface of streams and rivers?

• Moss

• Fern

• Water lily

• Cactus

What role do aquatic plants play in streams and rivers?

• They decrease water flow.

• They provide oxygen and food for other organisms.

• They increase water temperature.

• They attract predators.

Which of the following is a recreational activity commonly associated with rivers?

• Rock climbing

• Hiking

• Cycling

• Fishing

How do streams and rivers contribute to human enjoyment of nature?

• By providing a noisy environment

• By offering a serene and beautiful setting

• By being difficult to access

• By having dangerous wildlife