Topic Test Answers

18 verified answers1 views
5

Which of the following does not contribute to water pollution?

A
forestry
B
industry
C
agriculture
D
none of the above
6

Which of the following is a limiting factor in lotic ecosystems?

A
pH
B
salinity
C
light intensity
D
all of the above
7

Insects are most likely found in which aquatic zone?

A
pelagic
B
littoral
C
benthic
D
all of the above
9

Wetlands help reduce erosion through _______.

A
nutrient absorption
B
sediment trapping
C
bacterial absorption
D
all of the above
10

Where is light penetration in a river or stream likely to be lowest?

A
the source
B
the mouth
C
the middle portion
D
none of the above
11

The main difference between stream pools and ponds is that stream pools _______.

A
have an observable current
B
are located inland
C
have no access to rivers or streams
D
are usually larger than ponds
13

Compare marshes, swamps, and bogs.

Answer:

Marshes, swamps, and bogs are all types of wetlands. This means that their soil can be saturated either permanently or seasonally. As wetlands, they are all characterized by high levels of biodiversity. Swamps tend to have a larger proportion of surface water than marshes and, in North America, are characterized by the presence of trees. Bogs have acidic groundwater as a result of their surface water resulting mainly from precipitation.

14

How is detritus important to wetland ecosystems?

Answer:

Detritus is important to wetland ecosystems, because it provides a food source for a variety of aquatic organisms.

16

Explain how the conversion of wetlands to farmland has impacted streams and rivers.

Answer not available
17

The abundance and variety of foods available in wetlands is a large contributor to their biodiversity.

A
T
B
F
18

Riparian foliage _______.

A
provides shade and shelter
B
increases photosynthesis of aquatic plants
C
limits the organic matter present in rivers and streams
D
all of the above
19

Where is light penetration in a river or stream likely to be lowest?

A
the source
B
the mouth
C
the middle portion
D
none of the above
20

Wetlands help reduce erosion through _______.

A
nutrient absorption
B
sediment trapping
C
bacterial absorption
D
all of the above

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