Chapter 7 Test Flashcards
Wetland dominated by non woody plants
Marsh
precipitation that can carry
pollutants into aquatic ecosystems
Runoff
Amount of dissolved salts in water
Salinity
Wetlands dominated by woody plants
Swamps
Area where freshwater mixes with salt water
Estuaries
limestone ridges built by tiny
animals
Coral reefs
located near the bottom of a pond or
lake
Benthic zone
Organisms that break down dead organisms
Decomposers
increase in nutrients in an aquatic
ecosystem
Eutrophication
aquatic zone found near the shore
Littoral zone
Threat against river ecosystem
Dams
Threat against marine organisms
Overfishing
Estuaries are productive ecosystems because they constantly receive nutrients from a. rivers and oceans. b. coral reefs. c. lakes and ponds. d. photosynthesis.
A. Rivers and oceans
In which of the following aquatic ecosystems are both littoral and benthic zones most likely found? a. open ocean b. coral reef c. lake d. none of the above
C. Lake
All of the following are examples of saltwater ecosystems except
a. mangrove swamps.
b. coral reefs.
c. salt marshes.
d. the Florida Everglades.
D. The Florida Everglades
One way in which wetlands control flooding is by
a. filtering out water pollutants.
b. absorbing water from rivers.
c. providing habitats for migratory wildlife.
d. reducing the amount of carbon dioxide released into the air.
B. Absorbing water from rivers
Which of the following is not a threat to coral reefs?
a. silt runoff
b. excessive nutrients
c. growth of algae
d. zooplankton
D. Zooplankton
aquatic organisms that float near
the surface of the water
Plankton
drifting algae
Phytoplankton
drifting animals
Zooplankton
aquatic organisms that dwell at the
bottom of the water
Benthos
aquatic organisms that are free-
swimming
Nekton
Where do many benthic organisms live?
a. attached to hard surfaces
b. in open water
c. near the surface of the water
d. attached to benthos
A. Attached to hard surfaces
What do barrier reefs do
Protect shoreline from erosion
What are mangrove trees
Trees that exist in marshes that have their roots both in and out of the water.
What are the benefits to estuaries
They provide protected harbors, access to the ocean, and connection to a river
What is a salt marsh
where rivers deposit their load of mineral-rich mud
