Section #: 9.3
Lakes and Freshwater Wetlands
Practice Test
1.
Many lakes in agricultural regions are eutrophic due to __________.
a.
excessive nutrients
b.
minimal algae growth
c.
reduced amounts of animal waste
d.
excessive sunlight
Hint
2.
Look at the map. Which city is most likely to see an increase in eutrophication in its lakes?
a.
Madison
b.
Lansing
c.
Springfield
d.
Indianapolis
Hint
3.
Which combination of characteristics allows the greatest amount of water to infiltrate into the ground?
a.
steep slopes, silty soils, and cool temperatures
b.
little slopes, sandy soils, and cool temperatures
c.
steep slopes, sandy soil, and hot temperatures
d.
low slopes, clay-rich soils, and hot temperatures
Hint
4.
What process adds oxygen to a lake?
a.
decay of plants
b.
decay of animals
c.
photosynthesis of plants
d.
breathing of animals
Hint
5.
Look at the data in the graph, showing how the water quality has changed in Lake Smith over forty years. What is the most likely explanation for this trend?
1950
1955
1960
1965
1970
1975
1980
1985
1990
Dissolved oxygen
(parts per million or ppm)
20
19
18
18
16
17
15
11
9
pH
7.6
7.2
7.1
7.0
6.8
6.8
6.5
6.1
5.8
Phosphate (ppm)
0.0
0.10
0.20
0.25
0.28
0.28
0.45
0.55
0.55
Nitrogen (ppm)
0.05
0.18
0.19
0.25
0.28
0.28
0.35
0.40
0.45
Largemouth bass
450
455
448
338
235
220
155
125
50
Mosses and grasses
0
0
2
5
15
18
29
35
55
a.
Higher phosphate and nitrogen levels suggest it was damaged by fertilizers.
b.
Lower oxygen levels indicate that too many fish were living in the lake.
c.
The dropping pH levels indicate that acid rain has been plaguing the region.
d.
The falling population of largemouth bass indicate that too much fishing has occurred on this lake.
Hint
