L.1

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

• chemosynthesis

• eutrophication

• nitrification

• photosynthesis

Tags

NGSS.MS-LS2-1

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

• Nitrates poison the water that fish breathe through their gills.

• Microorganisms in the water absorb all the oxygen, suffocating animals.

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

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

Tags

NGSS.MS-LS2-4

Why does fertilizer pollution stimulate the growth of algae in a pond?

• Algae are producers and use the fertilizer’s nutrients to rapidly multiply.

• Algae are producers and use the fertilizer’s nutrients during decomposition.

• Algae are parasites and absorb energy from the fertilizers in order to grow.

• Algae are herbivores that feed off of the plants, which grow due to the excess fertilizers.

Tags

NGSS.MS-LS1-5

NGSS.MS-LS2-1

NGSS.MS-LS2-4

A recreational lake experiences eutrophication because of excess nutrients. Based on this information, how would the recreational lake most likely appear?

• clear and blue

• oily and greasy

• murky and full of algae

• orange and rust-colored

Which best explains the importance of pH in determining the health of a water system?

• Most organisms living in water are able to adapt to changing water pH.

• Variations in the pH of water can indicate the presence of toxic substances.

• A low pH in ground water encourages the growth of photosynthetic organisms.

• Variations in the pH of water can affect the ability of water to absorb atmospheric gases.

Which process would most likely increase the dissolved oxygen level in a freshwater lake?

• algal bloom

• lake turnover

• photosynthesis

• respiration

Tags

NGSS.MS-LS1-6

Which factors can have the greatest effect on the health of a river system?

• type of soil and salinity

• nitrate levels and turbidity

• human consumption and pH

• natural disasters and tidal change

Tags

NGSS.MS-ESS3-4

NGSS.MS-LS2-3

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

• its depth and width

• its temperature and pH

• its location and depth

• its temperature and depth

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

• It has a low pH

• It is unsafe to drink

• It is too hot to drink

• It contains lots of chemicals

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

• an increase in fertilizer runoff

• a decrease in pollutants from farm runoff

• an increase in the health of the body of water

• an increase in oxygen levels in the body of water

Tags

NGSS.MS-LS2-1

NGSS.MS-LS2-4