ESS 8.3 Pretest Part 1

Pure water is neutral. If water is neither an acid or a base, what is the pH of water?

• 0

• 7

• 10

• 5

Which best describes the relationship between temperature and dissolved oxygen in a lake?

• As temperature increases, dissolved oxygen increases.

• As temperature increases, dissolved oxygen decreases.

• A change in temperature has no affect on the dissolved oxygen of water.

• As temperature decreases, dissolved oxygen decreases.

What does pH measure?

• nutrient level

• turbidity

• acidity/alkalinity

• dissolved oxygen

Which would be the most likely cause of large numbers of fish dying in a stream?

• decreased carbon dioxide

• low dissolved oxygen concentration

• high levels of mercury

• a lack of nitrogen

Tags

NGSS.MS-LS2-1

NGSS.MS-LS2-4

Which best determines the health of a lake used as a source of freshwater?

• the temperature and pH of the lake

• its location and depth

• its depth and width

• its temperature and depth

If a body of water has turbidity levels, what can most likely be concluded?

• It is too hot to drink.

• It has a low pH.

• It contains lots of chemicals

• It is unsafe to drink.

Which will occur if humans continue to overload water systems with excess nutrients?

• photosynthesis

• chemosynthesis

• nitrification

• eutrophication

Tags

NGSS.MS-LS2-3

Which does an increase in eutrophication indicate to scientists studying a body of water?

• An increase in oxygen levels in the body of water.

• An increase in the health of the body of water.

• An increase in fertilizer runoff.

• A decrease in pollutants from farm runoff.

Tags

NGSS.MS-ESS3-4

NGSS.MS-LS2-1

Which aspect of fertilizer pollution would have the greatest negative impact on an aquatic system?

• Algal blooms deplete the oxygen and block the sunlight from penetrating a body of water.

• Aquatic animals increase, adding producers to the food chain and feeding fish.

Tags

NGSS.MS-LS2-1

NGSS.MS-LS2-3

NGSS.MS-LS2-4

Which groundwater contaminant contained in fertilizers and pesticides comes from farms?

• bacteria

• sodium

• mercury

• nitrates