North Carolina Science Grade 8

Chapter 7: Oceans

Standardized Test Practice

1.
How are the producers in the chart below different from the consumers?

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A)The producers swim in deep water.
B)The producers make their own food.
C)The producers eat small fish.
D)The producers digest the nutrients in other organisms.
2.
If all the producers died, what would be the impact on the consumers?

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A)Consumers would begin making their own food.
B)Consumers would also die.
C)Consumers would reproduce more slowly.
D)Consumers would decompose organic matter.
3.
Which layer of water shows a rapid decrease in temperature with increasing depth?
A)deep-water layer
B)surface layer
C)thermocline
D)bottom layer
4.
Which group of organisms breaks tissue down and releases carbon dioxide and nutrients back to the environment?
A)decomposers
B)consumers
C)producers
D)photosynthetics
5.
What phenomena is occurring in this diagram?

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A)density currents
B)downwelling
C)El Niño
D)upwelling
6.
Why do the surface winds in this diagram move the surface water away from the coast?

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A)because of the gravitational pull of the Moon on Earth
B)because of the gravitational pull of the Sun on Earth
C)because of the speed of the wind
D)because of the Coriolis effect
7.
Which of the following cycles depends upon decomposers?
A)water cycle
B)oxygen cycle
C)nitrogen cycle
D)carbon cycle
8.
What forms when more dense seawater sinks beneath less dense seawater?
A)upwelling
B)density current
C)cold surface currents
D)algae
9.
What causes tides?
A)winds
B)the gravitational attraction between Earth and the Sun
C)the gravitational attraction of Earth, the Moon, and the Sun
D)the gravitational attraction between Earth and the Moon
10.
Animals that can actively swim in the ocean are called
A)plankton.
B)bottom dwellers.
C)producers.
D)nekton.
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