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WorksheetsHydrosphere 7 EOG Review
Total questions: 10
Worksheet time: 5mins
Fish, flies, and algae are bioindicators known to exist in a certain North Carolina river. Recently a chemical company was built upstream. Which environmental factor is most likely measured by these bioindicators in this river?
light
temperature
dissolved oxygen
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 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
Which describes the amount of dissolved oxygen in a healthy water system?
Dissolved oxygen is found in low amounts.
Dissolved oxygen is found in high amounts.
Dissolved oxygen stays within a set range.
Which may cause scientists to be concerned about the quality of lake water?
low levels of salt
low levels of arsenic
high levels of oxygen
high levels of nitrates
A new golf course is built next to a river. Over the past several months, the nitrate levels of the water in the river have been increasing. Which best explains the cause of the increasing nitrate levels?
increased growth of algae
decreased biodiversity
runoff from fertilizer
Which would a scientist expect to find in a lake that experienced a sudden increase in nitrate levels?
an increase in temperature
an increased number of fish
an increase in dissolved oxygen
an increased amount of algae and aquatic plants
In which way does a flood have the greatest impact on local water quality?
It causes aquifers to run out of water.
It cleans the water and decreases the turbidity.
It allows many foreign materials to enter the water.
It moves animals to new locations and increases biological diversity.
Which is a bioindicator?
current
insect
rock
water
A scientist collected water quality data in a protected estuary over time. The scientist measures a nitrate level of 6 ppm, and a dissolved oxygen level of 2 mg/L. Which would the scientist most likely conclude about this site?
The nitrate and oxygen levels are normal.
The nitrate levels are high, and the oxygen levels are low.
The nitrate levels are high, and the oxygen levels are healthy.
The nitrate levels are low, and the oxygen levels are unhealthy.
