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8th Grade EOG Review Guide
Unit 5: Ocean Zones
1. The difference between the photic and the aphotic zone of the ocean is:
a. The photic zone has hydrothermal vents and the aphotic zone does not.
b. The photic zone does not have sunlight, but the aphotic zone does.
c. The photic zone has sunlight and the aphotic zone does not.
d. The photic zone has cold seeps and the aphotic zone does not.
2. Most of the ocean’s autotrophs live in which zone of the ocean?
a. Benthic
b. Pelagic
c. Neritic
d. Aphotic
3. Extremophiles live in this part of the ocean and have adapted to cold temperatures, high pressures and
darkness:
a. Benthic
b. Pelagic
c. Neritic
d. Photic
4. Which of the following explains why it is important to study hydrothermal vent ecosystems?
a. They are polluted.
b. They can tell scientists about what the first life forms on Earth were like.
c. They cause global warming.
d. The make upwelling happen.
5. Where do hydrothermal vents get their heat from?
a. Volcanoes that erupt into the ocean.
b. From natural gas seeping out of the ocean floor.
c. From the movement of bacteria in the ocean water.
d. Volcanism under the oceanic crust.
6. Which of the following explains where cold seeps originate from?
a. Ocean currents
b. Underwater volcanoes that have super cooled lava
c. Natural gas that leaks out of the ocean floor
d. Bacteria eat away at the ocean floor, causing lava to leak through
7. Ecosystems on land depend on the sun for energy. Where does the energy come from in vent and seep
communities?
a. Scavengers
c. Chemosynthesis
b. Photosynthesis
d. Symbiotic Relationships
8. Which types of organisms are producers at vent and seep communities?
a. Bacteria
b. Scavengers
c. Small fish
d. Large fish
9. Tubeworms host chemosynthetic microbes on or within their bodies providing a place for the microbes to live in
exchange for nutrients produced by the microbes. Which type of symbiotic relationship is this?
a. Parasitism
b. Commensalism
c. Competition
d. Mutualism
10. Sea life has to adjust to varying amounts of water and be very adaptable in this ocean zone:
a. Aphotic
b. Benthic
c. Intertidal
d. Pelagic