Unit 2: Freshwater Review

What are organisms living on, near, or in the sediment of lakes called?

• Nekton

• Plankton

• Decomposers

• Benthos

This lake zone suffers from a lack of light and has limited photosynthesis:

• Littoral
• Benthic
• Profundal
• Limnetic

Eutrophic lakes are characterized by...

• low nutrients, low oxygen
• low nutrients, high oxygen
• high nutrients, low oxygen
• high nutrients, high oxygen

Which is NOT a freshwater ecosystem?

• a river
• a lake 
• an estuary
• a stream

Headwaters are

• the end of a river.

• also know as wetlands.

• the start of a river.

• small ponds.

The zone near the shoreline in a lake is known as the _________________zone.

• benthic

• limnetic

• littoral

• profundal

_____________ are wetlands that are dominated by woody plants, such as trees.

• marshes 
• swamps  
• estuaries

An area where land is periodically underwater.

• Wetland

• River

• Lake

• Stream

____________________are freshwater wetlands that contain non-woody plants.

• marshes

• swamps

• estuaries

The open water zone of a lake where most photosynthesis occurs

• Profundal

• Limnetic

• Littoral

• Benthic