Limiting Factors in Water Biomes: Salinity and Dissolved Oxygen

Which factor directly refers to the amount of salt in a body of water?

• pH

• Salinity

• Sunlight

• Dissolved oxygen

Which list includes two limiting factors specifically highlighted for water biomes?

• Temperature and wind

• Salinity and dissolved oxygen

• Soil type and elevation

• Predators and prey

Match each water quality term with its best description.

• Acidity or basicity

• Salinity

• Oxygen not bonded to other elements dissolved in water

• Dissolved oxygen

• Amount of dissolved salts

• pH

Salinity is typically expressed using which unit?

• Parts per million (ppm)

• Grams per liter (g/L)

• Parts per thousand (ppt)

• Meters per second (m/s)

What does a salinity value describe?

• The grams of salt per 1,000 grams of water

• The grams of oxygen per 1,000 grams of water

• The number of fish per 1,000 liters of water

• The pH change per 1,000 minutes

Tags

NGSS.MS-LS2-4

NGSS.MS-LS1-5

Which statement about high salinity is supported by the material?

• It always improves drinking water quality.

• It can affect agriculture, drinking water supplies, and ecosystem health.

• It only occurs in freshwater lakes.

• It measures oxygen content.

Tags

NGSS.MS-LS2-4

Dissolved oxygen is best defined as:

• Oxygen gas trapped in ice crystals

• Oxygen in water that is not bonded to other elements

• Oxygen bonded to hydrogen in water molecules

• Oxygen in the atmosphere above the water

Dissolved oxygen is typically measured in which unit?

• Parts per thousand (ppt)

• Parts per million (ppm)

• Millimeters of mercury (mmHg)

• Kelvin (K)

What does a dissolved oxygen reading represent?

• Units of oxygen per 1,000 units of water

• Units of oxygen per 1,000,000 units of water

• Grams of salt per 1,000 grams of water

• The percentage of sunlight reaching water

Tags

NGSS.MS-LS2-3

NGSS.MS-LS2-4

NGSS.MS-LS2-1

Why is dissolved oxygen important in aquatic environments?

• It neutralizes acids in water.

• It is essential for the survival of fish and other aquatic organisms.

• It increases the water’s salinity.

• It prevents evaporation.

Tags

NGSS.MS-LS2-3

NGSS.MS-LS2-4

NGSS.MS-LS2-1