Lesson 1.3.4 Quiz

What happens to the water as depth increases?

• temperature decreases

• salinity increases

• light decreases

• oxygen decreases

What would happen to the size of a population of phytoplankton, microscopic producers, if the amount of sunlight they receive was reduced?

• The population size would increase.

• The population size would decrease.

• The population size would remain the same.

• The population size would fluctuate randomly.

Chemoautotrophs are producers that are able to make their own food using chemicals found in the environment. Why would these producers replace plants in the deepest parts of the ocean?

• Because there is no sunlight for photosynthesis.

• Because they can survive in high-pressure environments.

• Because they require less energy to produce food.

• Because they are more efficient than plants.

Manatees are able to tolerate a water pH range from 6-8. What would happen to the manatee population if the water pH dropped to 5.5?

• The manatee population would increase.

• The manatee population would decrease.

• The manatee population would remain the same.

• The manatee population would migrate to another area.

Pure water has a

• Neutral pH 
• Negative pH
• Positive pH
• Both Negative and Positive pH

On the pH scale 6 and lower is a(n) ______

How does salinity typically change with increasing ocean depth?

• Salinity increases with depth.

• Salinity decreases with depth.

• Salinity remains constant with depth.

• Salinity fluctuates randomly with depth.