Unit 1 Review: The Ocean and Its Populations

Organisms have all of the following in common EXCEPT

• need for oxygen

• need for water

• need for nutrients

• how they reproduce

Most sea life lives in the

• sunlight zone

• twilight zone

• midnight zone

• deep zone

What percentage of the ocean’s water is in the sunlight zone?

• 3%

• 5%

• 8%

• 15%

How much sunlight does the twilight zone get?

• none at all

• a lot in the summer but none in the winter

• the small amount that penetrates the sunlight zone

• almost as much as the sunlight zone

The deep zone includes all of the following EXCEPT

• hadalpelagic zone

• mesopelagic zone

• bathypelagic zone

• abyssopelagic zone

Which of the following is a distinguishing characteristic of the hadalpelagic zone?

• It is below most of the ocean’s floor.

• It is very cold.

• There is no light.

• There is a lot of water pressure.

What percentage of the ocean’s floor is found in the abyssopelagic zone?

• 50%

• 84%

• 75%

• 63%

What little light there is in the deep ocean is provided by

• disruptions such as hurricanes

• the mesopelagic zone

• exceptionally sunny days

• bioluminescent animals

The zones of the ocean are distinguished by their varying levels of all of the following EXCEPT

• Oxygen

• water

• sunlight

• water pressure

In the deepest zone of the ocean, water pressure is

• 5,850 pounds per square inch

• 3 tons per square inch

• 9,680 pounds per square inch

• 8 tons per square inch