Ocean Ecosystems-Notes

Multiple Choice

Review

Which aquatic biome forms where freshwater streams or rivers merge with the ocean?

______________ form where freshwater streams or rivers merge with the ocean.

• Estuaries
• Watershed

• River Basin

• Open Ocean

Multiple Choice

What role do phytoplankton play in the carbon cycle as depicted in the diagram?

• They consume food

• They release carbon dioxide

• They uptake carbon dioxide

• They decompose organic matter

Multiple Choice

What are the two main gases dissolved in seawater that marine plants depend on for photosynthesis?

• Oxygen and Nitrogen

• Oxygen and Carbon Dioxide

• Carbon Dioxide and Methane

• Nitrogen and Helium

Multiple Choice

Based on the diagram of the ocean carbon cycle, what process allows carbon dioxide (CO₂) from the atmosphere to move into the ocean and be used by marine organisms?

• Volcanic eruptions releasing CO₂

• Phytoplankton photosynthesis

• Zooplankton grazing

• Microbial respiration

Multiple Choice

What factors affect the amount of gas that water can hold?

• Temperature

• Salinity

• Pressure

• All of the above

Multiple Choice

True or False?

River run-off, ocean temperature, and ocean depth affect salinity.

• True

• False

Multiple Choice

What process is illustrated in the diagram that involves the movement of nutrient-rich water to the surface?

• Downwelling

• Upwelling

• Thermohaline circulation

• Surface runoff

Multiple Choice

Why are ROVs able to go into the deep ocean?

• They are built to reach high speeds

• They are built to deal with extreme pressure from the water

• They are built to transport tons of divers

• They are built to be able to reach the surface at a high speed

Multiple Choice

What types of species are found in hydrothermal vents according to the image?

• Fish

• Mollusks

• Crustaceans

• All of the above

Multiple Choice

The water at some areas along the mid-ocean ridges are very hot because ...

• earth's magnetic field creates heat
• The areas are closer to the core
• There is more sunshine
• There are hydrothermal vents along the mid-ocean ridges