Hydrosphere

Which of these organisms is a producer?

• Algae

• Seal

• Sea Star

• Coral

Which of these gases is produced during

photosynthesis?

• oxygen

• carbon dioxide

• nitrogen

• water vapor

How do some deep­-water bacteria in the ocean make food?

• chemosynthesis

• photosynthesis

• respiration

• rifting

Why are estuaries an important habitat for many organisms?

• There is more food available in estuaries as compared to the open ocean.

• There is more salt available in estuaries as compared to the open ocean.

• There are fewer nutrients in estuaries as compared to the open ocean.

• There are more predators in estuaries as compared to the open ocean.

What resource would be greatly reduced if

microscopic algae in the oceans were to disappear?

• oxygen

• water

• carbon dioxide

• organic nitrogen

The upwelling of deep ocean currents in some areas results in ______.

• nutrient rich water

• rough seas

• decrease in marine life

• coastal flooding

Phytoplankton release half of the world’s oxygen. In what part of the marine ecosystem does this occur?

• ocean surface

• estuaries

• bottom of the ocean

• hydrothermal vents

What factor mostly affects the amount of

dissolved oxygen in ocean water?

• temperature

• solubility

• salinity

• pressure

Matter cannot be ___________ during a

chemical reaction such as photosynthesis or chemosynthesis

• created nor destroyed

• changed

• destroyed

• created

Which best explains why estuaries are productive ecosystems?

• They receive nutrients from both rivers and the ocean

• They have high saltwater content

• They have high levels of dissolved gases

• They receive chemicals from commercial and industrial runoff