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