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Nitrates
Test Description: Water quality attribute Nitrates
Instructions: Answer all questions to get your test result.
1) Nitrates exist in which form normally?
A
Positive ions
B
Negative ions
C
Neutral molecule
D
Neutral atom
2) Nitrates are used by which of the following?
A
All of the above answers are correct
B
Fish
C
People
D
Plants
3) Fish excrete nitrates in the form of what compound?
A
Pneumonia
B
Hydrogen hydroxide
C
Carbon-dioxide
D
Ammonia
4) Which answer choice uses nitrates to stimulate growth?
A
Sunlight
B
Inert elements
C
Plants
D
Atmosphere
5) Excess nitrates in the water do NOT cause which of the following?
A
Algae to grow unchecked
B
Unstable dissolved oxygen levels in the water
C
Fish to grow more rapidly
D
Fish to be stressed and stop feeding
6) Assuming that there is an excess of nitrates in a body of water and algae grow unchecked across the surface of the water, what is the major effect that this will have on the water?
A
The algae will block the sunlight from reaching down into the water
B
The algae will turn the water purple
C
The algae will increase the amount of sunlight that reaches the bottom of the water
D
The algae will make the water clear
7) What human actions cause nitrates to get into ground water?
A
(a), (b) and (c)
B
Allowing septic tanks to overflow
C
Allowing untreated water from a sewage treatment plant to enter a waterway
D
Spreading too much commercial fertilizers on farmland
8) Which of the following is NOT a characteristic of nitrates?
A
Appears white in water
B
Colorless
C
Soluble (able to dissolve) in water
D
Odorless
9) Generally, the presence of excess nitrates in water is harmful?
A
true only for humans
B
true for all species
C
true only for fish
D
false
10) If a large amount of nitrates are present in a body of water, what color will the water usually be?
A
Green
B
Purple
C
Blue
D
White
*select an answer for all questions
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