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Aquatic Ecosystems Rev. #2
Test Description: Chapter 7: Freshwater and Marine Biomes
Instructions: Answer all questions to get your test result.
1) From where do most of the nutrients in the Arctic come?
A
arctic lakes
B
melting ice
C
the ocean
D
decomposing marine organisms trapped in the ice
2) What is effective at forming a nutrient trap?
A
the benthic zone of the deep ocean
B
wave action on a rocky shore
C
melting ice from polar ecosystems
D
fresh water from rivers mixing with salt water from oceans in estuaries
3) Which of the following marine ecosystem is the least productive?
A
coral reefs
B
shallow, coastal waters
C
littoral zone
D
deep open ocean waters
4) What is the base of marine food webs?
A
plankton
B
nekton
C
large marine carnivores
D
coral polyps
5) What is the source of most ocean pollution?
A
spills from oil tankers
B
activities on land
C
waste from fishing ships
D
global warming
6) Which of the following is NOT a marine ecosystem?
A
salt marsh
B
Great Barrier coral reef
C
the Florida Everglades
D
mangrove swamps
7) Which of the following is NOT a threat to coral reefs?
A
coral being exposed to salt water
B
silt runoff which leads to muddy waters
C
excessive nutrients which leads to excessive algal growth
D
diving and fishing
8) One way in which wetlands control flooding is by ---.
A
absorbing water from rivers
B
providing habitats for migratory wildlife
C
filtering out water pollutants
D
reducing the amount of carbon dioxide released into the air
9) What adaptation prevents phytoplankton from sinking into deep waters?
A
streamlined body shape
B
whiskers
C
stinging tentacles
D
flagella
10) What distinguishes nekton from benthos?
A
one lives only in rivers and the other lives only in lakes
B
one lives in freshwater and the other lives in salt water
C
one swims freely and the other is often attached to hard surfaces
D
one is a predator and the other is a primary producer
*select an answer for all questions
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