Dissolved Oxygen in Water

Which are the most abundant dissolved gases in ocean water?

• nitrogen and carbon dioxide

• oxygen and carbon dioxide

• oxygen and methane

Which best describes the source of oxygen in ocean water?

• Oxygen is produced by marine plants in the process of making food.

• Oxygen is produced through the exhalations of marine animals.

• Oxygen is produced through precipitation falling on the ocean.

• Oxygen is produced by nodules on the ocean floor.

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NGSS.MS-LS2-3

Which are the two main sources of the dissolved oxygen in the ocean?

• surface air and ocean plants

• warm water vents and Earth’s core

• underwater volcanoes and earthquakes

• animal respiration and dead matter decomposition

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Which type of ocean water would contain more dissolved oxygen?

• cold ocean water in polar regions

• warm ocean water in tropical regions

• temperate ocean water in subtropical regions

Why do plant plankton not grow in the deep ocean?

• because sunlight does not reach the deep ocean

• because too many animals eat it before it can grow

• because there are not enough dissolved gases to support it

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Which best describes the relationship between salinity levels and the amount of dissolved gases in ocean water?

• As salinity increases, the amount of dissolved gases increases.

• As salinity increases, the amount of dissolved gases decreases.

• As salinity decreases, the amount of dissolved gases decreases.

• As salinity decreases, the amount of dissolved gases remains the same

Which dissolved gas is added to ocean water as a result of photosynthesis?

• oxygen

• nitrogen

• carbon dioxide

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How is the amount of oxygen in ocean water affected by temperature?

• The amount of oxygen in ocean water increases as temperature increases.

• The amount of oxygen in ocean water increases as temperature decreases.

• The amount of oxygen in ocean water decreases as temperature decreases.

• The amount of oxygen in ocean water is kept constant as temperature decreases.

Which dissolved gases are most needed by plants and animals living in the ocean?

• nitrogen and oxygen

• oxygen and carbon dioxide

• carbon dioxide and nitrogen

• carbon monoxide and nitrogen

Why is productivity greatest near the ocean’s surface?

• More predators live in the top layers of the ocean.

• Salinity at all layers of the open ocean is fairly consistent.

• Sunlight penetrates the top layers of the ocean, so photosynthesis occurs there.

• Nutrients, minerals, and gases are more available to marine life in the bottom layers of the ocean.

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NGSS.MS-LS1-6

NGSS.MS-LS2-3