Chapter 7 Aquatic Biomes

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

• sunlight

• temperature

• distance below the water's surface

• the presence of plankton

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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

Plankton are important to aquatic ecosystems because plankton are

• the base of aquatic feeding relationships

• the recyclers of aquatic ecosystems

• able to control most predators, thereby encouraging more diversity

• unique producers that are chemosynthetic rather than photosynthetic

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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 surface of the pond

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Where is most of the life found in a pond or lake?

• in the open-water zone

• in the benthic zone

• in the littoral zone

• evenly dispersed throughout the pond

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What distinguishes a eutrophic lake from other lakes?

• 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.

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

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