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Q 1/13
Score 0
Kevin measured the dissolved oxygen levels in the Chesapeake bay. He compared his measurement with the oxygen required by different species of animals that live in the bay. If Kevin's reading showed that the dissolved oxygen was 4, which species would be at risk?
60
blue crabs, yellow perch, and striped bass
yellow perch and striped bass
striped bass
worms, blue crabs, yellow perch, and striped bass
Q 2/13
Score 0
The health of any water system relies on the balance of many factors. Suppose a river's pH level drops sharply due to construction projects on its banks. Which statement best predicts how such a change will affect the organisms that live in the river?
60
The organisms that live in the river will quickly adapt to the current pH level.
Most of the organisms that live in the river will die, even if the change is very slight.
A number of organisms that live in the river might die depending on the severity of the drop.
The organisms that live in the river will be healthier depending on the amount of the drop.
13 questions
Q.
Kevin measured the dissolved oxygen levels in the Chesapeake bay. He compared his measurement with the oxygen required by different species of animals that live in the bay. If Kevin's reading showed that the dissolved oxygen was 4, which species would be at risk?
1
60 sec
Q.
The health of any water system relies on the balance of many factors. Suppose a river's pH level drops sharply due to construction projects on its banks. Which statement best predicts how such a change will affect the organisms that live in the river?
2
60 sec
Q.
The Fish and Wildlife Commission is conducting research on fish populations in one of the nation's largest rivers. According to the research, fish numbers are steadily declining each year. If the scientists want to better understand what is happening to the fish, what measurement would yield the best data?
3
60 sec
Q.
Many cities have volunteer programs for citizens to monitor the water quality of the neighborhood streams and ponds. Why is it important to monitor a watershed's water quality?
4
60 sec
Q.
Why are water quality standards important?
5
60 sec
Q.
How could a scientist best investigate whether a certain pesticide that is harmful to fish is being carried into the water supply?
6
60 sec
Q.
Which of the following can cause a decrease in dissolved oxygen in the water?
7
60 sec
Q.
Water clarity, or turbidity, measures the amount of sediment and debris in a body of water. Since light cannot shine into water with low clarity, turbidity is a factor that is considered when monitoring water quality. Which of the following organisms would be most negatively affected by unclear water?
8
60 sec
Q.
Why is an overabundance of nutrients harmful to a water supply?
9
60 sec
Q.
Society makes sure that water is safe for people to drink by making sure people do not add dangerous chemicals to lakes and rivers.
10
60 sec
Q.
Society makes sure that water is safe for people to drink by monitoring the water to look for dangerous substances.
11
60 sec
Q.
Society makes sure that water is safe for people to drink by making sure the water looks clear.
12
60 sec
Q.
Society makes sure that water is safe for people to drink by storing the water in plastic bottles.
