Freshwater Ecosystems

All of the following are abiotic factors that influence aquatic ecosystems except-

• sunlight.

• temperature.

• distance below the water's surface.

• the presence of plankton.

Which of the following is not one of the three main groups of aquatic life?

• nekton

• benthos

• pelagos

• plankton

Crabs and clams are types of ___________________.

• nekton

• benthos

• zooplankton

• phytoplankton

Where is the littoral zone of a pond or lake?

• at the edge of the pond near the shore.

• along the bottom of the pond

• in the center of the pond

• at the deep end of the pond

Where is most of the life found in a pond or lake? In this area, aquatic life is diverse and abundant.

• in the open water zone

• in the benthic zone

• in the littoral zone

• evenly dispersed throughout the pond

What distinguishes a eutrophic lake from other lakes? They are rich in nitrates.

• Eutrophic lakes are saltwater lakes.

• Eutrophic lakes are found in cold regions and support little growth.

• Eutrophic lakes are large and deep.

• Eutrophic lakes are nutrient rich and support a large plant population.

Wetlands are beneficial because they-

• support a wide variety of plant and animal life.

• play an important role in flood control

• provide recreational areas.

• all of the above.

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NGSS.MS-LS2-4

NGSS.MS-LS2-5

Which of the following is a characteristic of swamps?

• a treeless wetland where cattails and rushes grow.

• a low lying area with trees in standing water

• an area found along the shores of a pond or small stream

• a pond that is slowly filling in

Which of the following most directly explains how pesticides that are sprayed on your lawn could end up in a river?

• dumping

• industries

• dams

• runoff

What are the two main types of freshwater wetlands?

• lakes and ponds

• rivers and streams

• littoral zones and benthic zones

• marshes and swamps