AnswersEnvironmental Science - SC2028 AEcology 101

Effects of Cycles on Ecosystems Answers

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1
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Why does the government not do more to regulate nonpoint source pollution?

A
Nonpoint source pollution is less harmful to the environment, so it does not need to be regulated.
B
Point source pollution is more common than nonpoint source pollution, so it is more regulated.
C
Nonpoint source pollution is caused solely by animals, which are not possible to regulate.
D
Nonpoint source pollution is difficult to regulate, because its source is difficult to track.
2
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Where is water stored?

A
clouds
B
the ground
C
animals
D
all of the above
3

Living organisms do not play a role in the water cycle.

A
T
B
F
4

Fertilizer in ponds or streams would most likely be considered point source pollution.

A
T
B
F
5

Which of the following contributes to nonpoint source pollution in water?

A
automobiles
B
oil refineries
C
paper mills
D
water treatment plants
6

What are the ways that water vapor can reenter the atmosphere?

A
sublimation
B
evaporation
C
evapotranspiration
D
all of the above
7

How does water enter the atmosphere?

A
Liquid water evaporates from lakes when heated by the sun.
B
Frozen water sublimates from ice and snow.
C
Liquid water is lost from tree leaves during evapotranspiration.
D
All of the above.
8

How much of the Earth’s water is usable as a freshwater resource?

A
75%
B
3%
C
100%
D
25%
9

Why is nonpoint source pollution potentially more harmful than point source pollution?

A
Nonpoint source pollution disrupts the water cycle.
B
Nonpoint source pollution is difficult to regulate.
C
Nonpoint source pollution comes from more than one source.
D
Nonpoint source pollution is more damaging to living organisms than point source pollution.
10

What happens to water in the atmosphere as it rises?

A
It evaporates.
B
It condenses and forms clouds.
C
It combines with other gases in the air.
D
It is used up.
11

How does capillarity help sustain life?

A
Plants use capillarity to move water from their roots to their leaves.
B
Capillarity allows water to form droplets.
C
Animals rely on capillarity to maintain their body temperatures.
D
Water’s capillarity allows many different substances to dissolve in water.
12

Aquifers are _______.

A
structures used to transport water from city to city
B
created through evapotranspiration
C
densely packed snow close to becoming glaciers
D
layers of porous rock or sand
13

What role do aquifers play in the water cycle?

A
They store water in the ground.
B
They transfer water to the air.
C
They are the main source of water on Earth.
D
They move water through capillarity.
14

The water on the Earth today has been sustaining life for millions of years.

A
T
B
F

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